Update CoreClr to preview1-26813-05

Commit migrated from https://github.com/dotnet/corefx/commit/d32bb2b02efee7b9b6070e16605776e2661101f3

Increate ReadAsyncCompletesIfFlushAsyncCanceledMidFlush timeout to 5 minutes (dotnet/corefx#31745)

Commit migrated from https://github.com/dotnet/corefx/commit/d7e4ebe62eb7c72e211e183839a2a5b28577c31d

add corelib helper (dotnet/corefx#31739)

Commit migrated from https://github.com/dotnet/corefx/commit/e62a4bdcd623193c1aa9ad2877c1137b068b3224

Update CoreFx, CoreSetup to preview1-26813-02, preview1-26813-01, respectively (dotnet/corefx#31737)

Commit migrated from https://github.com/dotnet/corefx/commit/9301706972eb90757f335d8ad2601b54d1f56c67

Update CoreFx, CoreSetup to preview1-26813-01, preview1-26812-01, respectively (dotnet/corefx#31730)

Commit migrated from https://github.com/dotnet/corefx/commit/497fa20e70c9739d213aa07e940207a581f6a93e

removing duplicate files

Commit migrated from https://github.com/dotnet/corefx/commit/1edf4ef86c033a71b379f894b2f8e78c1820de6a

Revert "Add Win32 File.Encrypt/Decrypt() implementation (dotnet/corefx#31585)" (dotnet/corefx#31725)

This reverts commit dotnet/corefx@cc9eaa79b526c2b23ee16f4e453e428e2e84a7df.

Commit migrated from https://github.com/dotnet/corefx/commit/bbda7f35fc46af191978f93434786c218cf5f12c

Update CoreFx, CoreSetup to preview1-26811-01, preview1-26810-04, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/afedf8ccedf8b9470393c8678c9973a5be1be39a

Create Microsoft.IO.Redist (dotnet/corefx#31679)

* Create Microsoft.Internal.IO

Includes all of Path, Directory, *Info, etc. from System.IO with targets of NetFX 4.6.1 and NetCore 2.1.

* Tweaks / minor fixes

* Remove netstandard build.

* Add package

Update to build for 4.7.2 only

* Rename folder to prepare for project rename

* Change the name to Microsoft.IO.Redist

* Namespace tweaks

* Use open key, tweak references

* More tweaks on feedback

Also grab latest build tools for 4.7.x RIDs

Commit migrated from https://github.com/dotnet/corefx/commit/1bff7880bfa949e8c5e46039808ec412640bbb5e

Port a change from servicing branch (dotnet/corefx#31702)

Commit migrated from https://github.com/dotnet/corefx/commit/caa3ab49a2045568177c90bb709e4e410cfa7a08

Add Win32 File.Encrypt/Decrypt() implementation (dotnet/corefx#31585)

* Add Win32 File.Encrypt/Decrypt() implementation

* address PR feedback

* address PR feedback

* skipt on Nano Server

* fix WinRT/UWP build

Commit migrated from https://github.com/dotnet/corefx/commit/cc9eaa79b526c2b23ee16f4e453e428e2e84a7df

Add Microsoft-Windows-DotNETRuntime to the list of framework EventSources. (dotnet/corefx#31691)

Commit migrated from https://github.com/dotnet/corefx/commit/1fe4dd9aa3aa88ffbab2f01274e14b6e0603cc26

Add logging for SocketsHttpHandler SendAsync task cancelled (dotnet/corefx#31644)

* add logging for task cancellation

* address feedback

* address feedback

Commit migrated from https://github.com/dotnet/corefx/commit/9bae404539b005391b410005d8d4524a2fa48f31

Fix pipe completion behavior (dotnet/corefx#31685)

Commit migrated from https://github.com/dotnet/corefx/commit/a3060aea16a48e721e39c55ab665709cff043d6a

Update CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26810-04, preview1-26810-04, preview1-26810-02, beta-26810-00, beta-26810-00, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/e1f16a335950a830e5ffc594449a24c715c005b4

Annotate reflection fallback for S.P.DataContractSerialization (dotnet/corefx#31533)

This adds [removable feature annotation](dotnet/designsdotnet/corefx#42) to data
contract serialization.

If the user specifies that they would like to remove support for this
at publish/native compilation time, the linker/compiler is going to
replace the annotated method bodies with a throwing method body.
The exception message is going to inform the user that the feature
has been removed because they opted into the removal. The throwing
method body is significantly smaller than the transitive closure
of code reachable from the original method body.

Contributes to dotnet/corefx#30597. Turning this feature off in the UWP People app
saves 4% of size. This is a size on disk regression that came with
the new version of CoreFX and blocks the Windows team in picking up
the latest framework. There is a zero size growth goal.

Commit migrated from https://github.com/dotnet/corefx/commit/d21453e1cfa2e2546deccbd3a4be46341e4ba5d1

Prep key enums for binary serialization (dotnet/corefx#31641)

* Prep key enums for binary serialization

* Add enum blobs to formatter test data;

* Set correct blobs

Commit migrated from https://github.com/dotnet/corefx/commit/8ce7ff4f04bf288dca6d89a27e3e48cf096b7b46

Update CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26809-04, beta-26809-01, beta-26809-01, respectively (dotnet/corefx#31681)

Commit migrated from https://github.com/dotnet/corefx/commit/1a9aa57627a7d173adc1c7ccff6a9471aecc7235

Merge pull request dotnet/corefx#31667 from MattGal/sles-15-testing

Adding SLES 15 to Rid graph and test queues

Commit migrated from https://github.com/dotnet/corefx/commit/1e561a4ee2d1d174b5a8dff64f9e20a2f9e34685

PR Feedback:  Add opensuse 15.0 as well.

Commit migrated from https://github.com/dotnet/corefx/commit/1a581232108642b932f3994816f19af46b33a189

Update CoreClr, CoreFx, CoreSetup to preview1-26809-07, preview1-26809-05, preview1-26809-01, respectively (dotnet/corefx#31668)

Commit migrated from https://github.com/dotnet/corefx/commit/a00c4e240a207efa3e3603f120548c34d7eba3c1

Issue dotnet/corefx#30252 is by design (dotnet/corefx#31656)

Commit migrated from https://github.com/dotnet/corefx/commit/25d0f5c20edddbf872d17fa699b4279c0827c320

Another Case where millisecond Granularity was missed (dotnet/corefx#31593)

* MilliSeconds added

* Test Added for move operation

* LastAccessTimeTest

* avoid overflow and using both seconfs and nanoseconds of the native

* feedback addressed

* Tests fixed for CI

* Feedback addressed

* method signature changed

* removing comments

* named argument added

Commit migrated from https://github.com/dotnet/corefx/commit/510eaf10912ce5790302addb0171916b9a134000

Add stuff for SLE15 in runtime graph stuff.

Commit migrated from https://github.com/dotnet/corefx/commit/10a71afadabcfbef4ec5a92b9a5775f6bc8b1118

Updating init-tools.cmd to pass through PACKAGES_DIR

Commit migrated from https://github.com/dotnet/corefx/commit/bfc4b639b75f8d47ea895ba1dff790b5f739f6cd

Update BuildTools, CoreSetup to preview1-03108-01, preview1-26808-05, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/5dc2f8ddee4f154b32141cc13aa35e097199649e

Add SLES 15 to various build pipelines.

Commit migrated from https://github.com/dotnet/corefx/commit/4c83143f44b27f689c044620e68891c8b38310eb

System.Transactions, enable strict and fix struct-null comparisons (dotnet/corefx#31543)

* enable strict compiler feature and fix all invalid struct-null comparisons

* fixup formatting

* remove explict strict feature setting

Commit migrated from https://github.com/dotnet/corefx/commit/88d9c3329d91b30b70b349b7e5abe6678592bd7a

Use explicit delegate types for interop to make the code AOT friendly (dotnet/corefx#31654)

Also deleted some dead code while I was on it

Commit migrated from https://github.com/dotnet/corefx/commit/7d8d390cf7982be3d07adc6a6e727fd3be0ab774

Limit ReadAsyncCompletesIfFlushAsyncCanceledMidFlush iteration count

Commit migrated from https://github.com/dotnet/corefx/commit/6c60a1f11787759fc0eabdc5d0df8925037236de

Support UInt64 as underlying type of enum in EnumConverter (dotnet/corefx#31095). (dotnet/corefx#31152)

Commit migrated from https://github.com/dotnet/corefx/commit/c26eb56a6222a581fb51b672c6503ba2ead3fdca

Update CoreClr, ProjectNTfs, ProjectNTfsTestILC to preview1-26808-04, beta-26808-00, beta-26808-00, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/5ac0c6e61b08087c7319f4c73e29c2cdd0918112

Add known issue on macOS

Commit migrated from https://github.com/dotnet/corefx/commit/0b337a9719e663c28e89f402b2614d8e1a0f877b

Extend invoke test coverage for byreflike ref returns (dotnet/corefx#31624)

Commit migrated from https://github.com/dotnet/corefx/commit/10d38e565edf6cf822a4a440e9cd2dbc2c54e2c3

Update BuildTools, CoreSetup to preview1-03107-02, preview1-26807-04, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/99b7e5df45e1a0eab7ba16ce51beab07cf58aefb

Update BuildTools, CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-03107-01, preview1-26807-05, preview1-26807-04, preview1-26807-01, beta-26807-00, beta-26807-00, respectively (dotnet/corefx#31620)

Commit migrated from https://github.com/dotnet/corefx/commit/b492409b4a1952cda4b078f800499d382e1765fc

Fix Dictionary tests to work in all frameworks (dotnet/corefx#31630)

Commit migrated from https://github.com/dotnet/corefx/commit/5524fb540121fa69380c3279708d5fc5c462fbee

Make UWP GetPortNames closer to Fx one (dotnet/corefx#31591)

Commit migrated from https://github.com/dotnet/corefx/commit/d07e5ad9a68ba2db432ba9aa8ee47d256b957ca4

Convert X500NameEncoder to use AsnWriter

Commit migrated from https://github.com/dotnet/corefx/commit/f1d07c81b5095fbcc66cefc7119f38d0acca5d80

Extend reflection test coverage for pointer-typed properties (dotnet/corefx#31615)

Commit migrated from https://github.com/dotnet/corefx/commit/1533e38ec7ed0080d418c2c980343c62d612ff75

Update breaking change guidance re: adding interface to existing type (dotnet/corefx#31616)

Commit migrated from https://github.com/dotnet/corefx/commit/2340b22bacd991c9b5ff585bb6257229ec65b098

Implement HTTP/2 loopback server for frame level testing of SocketsHttpHandler (dotnet/corefx#31521)

This is an initial pass at support for frame level testing of the HTTP/2 protocol.

Commit migrated from https://github.com/dotnet/corefx/commit/66649ff5862c7b723fded40c505942de19bdb107

Update BuildTools to preview1-03106-01

Commit migrated from https://github.com/dotnet/corefx/commit/5773f3505ad435b317015452daf8c966467f31ec

Add HTTP/2 CookieContainer support (dotnet/corefx#31440)

* http/2 CookieContainer support

* address feedback

* address feedback 2

* remove grouping

* fix test issue

Commit migrated from https://github.com/dotnet/corefx/commit/f1be6ce925a2f3a97d8838674987f543058c0942

Move BackendSupportsAlpn check to CoreFx.Private.TestUtilities (dotnet/corefx#31592)

* add BackendSupportsAlpn to comon

* address feedback

* address feedback

Commit migrated from https://github.com/dotnet/corefx/commit/e4c68f518455c921b5d425df845dc12eba8081e4

Merge pull request dotnet/corefx#31584 from MattGal/remove-ubuntu-1710

Remove Ubuntu 17.10 from CoreFX official runs

Commit migrated from https://github.com/dotnet/corefx/commit/df5d561e11c1cff659cd9f37738f52519920f9fc

Update CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26806-04, preview1-26806-04, preview1-26806-01, beta-26806-00, beta-26806-00, respectively (dotnet/corefx#31604)

Commit migrated from https://github.com/dotnet/corefx/commit/a5502628c8a9a2f7bc7c48363c89db2eced2617a

Update CoreClr, CoreFx, CoreSetup to preview1-26806-01, preview1-26806-01, preview1-26805-04, respectively (dotnet/corefx#31603)

Commit migrated from https://github.com/dotnet/corefx/commit/e267ad25d58459b90be7cea74ea11b9689daf191

Fix implementation of WriteKeyParameterInteger

Commit migrated from https://github.com/dotnet/corefx/commit/1e2dfe2c2ef9ca04a46e38f6645021e5da39ffe3

Use GeneralNameAsn in SubjectAlternativeNameBuilder

Commit migrated from https://github.com/dotnet/corefx/commit/8d2407974c88b50c54f29ee20fd9deb8e6d00b1f

Update CoreClr, CoreFx, CoreSetup to preview1-26805-04, preview1-26805-04, preview1-26805-01, respectively (dotnet/corefx#31594)

Commit migrated from https://github.com/dotnet/corefx/commit/28cb4c8917c25033bb136055c3c2462907a281fe

Consolidate IsLegalKeySize and related methods into common code.

Commit migrated from https://github.com/dotnet/corefx/commit/aa731cb68cd60128cc4b1efcd8b1a8e859750755

Rename S.S.C.Pkcs internal `Helpers` class into `PkcsHelpers`

There are a variety of different parial `Internal.Cryptography.Helper` class parts split across
multiple assemblies.  This is causing problems for Mono because you cannot "combine" different
parts of partial class across assembly boundaries.

In Mono, the `System.Security.Cryptography.Pkcs` namespace lives in `System.Security.dll`,
but we are already using different parts of that internal class in our `mscorlib.dll`, which is
now causing conflicts due to [InternalsVisibleTo]

Commit migrated from https://github.com/dotnet/corefx/commit/5812dcbef2cde02a8213139085deefe666376f2c

Merge X509Certificates Oids with the common ones.

Commit migrated from https://github.com/dotnet/corefx/commit/85c4b4bdae8095c3681d4cd91e00894f26c3baf6

Merge pull request dotnet/corefx#30923 from BruceForstall/Arm64VSBuild2

Change arm64 build to use public VS tools instead of private toolset

Commit migrated from https://github.com/dotnet/corefx/commit/c1788c695d4349c522fc5620eff7d3dd46a0ab5f

Add macOS 10.14 Mojave to the RID graph  (dotnet/corefx#31548)

Add macOS 10.14 Mojave to Microsoft.NETCore.Platforms

Fixes https://github.com/dotnet/corefx/issues/31547

Commit migrated from https://github.com/dotnet/corefx/commit/b101ed555dd1fb91b24c4a9d5d665df9e68f335c

Expose EventWrittenEventArgs.OSThreadId and EventWrittenEventArgs.TimeStamp in the System.Diagnostics.Tracing contract. (dotnet/corefx#31564)

Commit migrated from https://github.com/dotnet/corefx/commit/c8c882c7366f2facfca4c8069de79da477dcf05b

Handle nt auth with Connection: close on initial challenge (dotnet/corefx#31527)

When we receive an initial NT auth challenge that has Connection: close set on the response, we need to proceed with authentication on a new connection.

Fixes dotnet/corefx#30327

Commit migrated from https://github.com/dotnet/corefx/commit/eedddac1bd10a7c8629a9db7f46fc8afc7385d63

Remove Ubuntu 17.10 from CoreFX official runs

Commit migrated from https://github.com/dotnet/corefx/commit/945b7405486de3e7042779c0319115ac6380e3e0

Update CoreClr, CoreFx, CoreSetup to preview1-26803-04, preview1-26803-03, preview1-26803-02, respectively (dotnet/corefx#31582)

Commit migrated from https://github.com/dotnet/corefx/commit/408fe4f405f4d67c554f03d8fc9e94eb7da55dbb

Update ProjectNTfs, ProjectNTfsTestILC to beta-26803-00, beta-26803-00, respectively (dotnet/corefx#31574)

Commit migrated from https://github.com/dotnet/corefx/commit/38c51476dea06b15d32b98caa64bf292f85f4258

Make `Vector64<T>`, `Vector128<T>`, and `Vector256<T>` readonly (dotnet/corefx#31573)

Commit migrated from https://github.com/dotnet/corefx/commit/ebbd513f2b9750e52b2db46cc78a0cd69c61943c

Move GeneralNameAsn from Pkcs to Common for sharing

Commit migrated from https://github.com/dotnet/corefx/commit/23915a606017197aed1d24960096b532d24d626e

Added System.Runtime.ProfileOptimization (dotnet/corefx#31067)

Commit migrated from https://github.com/dotnet/corefx/commit/23fab4631ed927f5657e4ab4a6ce4d45d08bcf7a

Update CoreClr, CoreFx, CoreSetup to preview1-26803-01, preview1-26803-01, preview1-26802-04, respectively (dotnet/corefx#31572)

Commit migrated from https://github.com/dotnet/corefx/commit/54516d08450150cb5fab4e07d999c5d4d4b46398

Fix looking up headers on HttpClient response (dotnet/corefx#31550)

Headers marked as `HttpHeaderType.Request` were not able to be accessed
via the `Headers.GetValues` method. When looking up a header,
the `HeaderDescriptor` gets set to to `HttpHeaderType.Custom` in
`GetHeaderDescriptor`, but the persisted header in `_headerStore` had
`HeaderType` set to `HttpHeaderType.Request`, so lookups would fail.
This change makes the insert logic consistent with the lookup logic.

Fixes dotnet/corefx#31143

Commit migrated from https://github.com/dotnet/corefx/commit/8917abaf35ea153f4bbf1098d74d02963ef08e76

Update CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26802-05, preview1-26802-04, preview1-26802-01, beta-26802-00, beta-26802-00, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/94044e225179b9e7cd5d45d9c959ccb5a222e5d2

Merge pull request dotnet/corefx#31566 from MattGal/update-fedoras

Removing Fedora 26 and adding 28 as appropriate.

Commit migrated from https://github.com/dotnet/corefx/commit/2642a25cb86b5897eebe9e3ff32da1155ca8de3e

Removing Fedora 26 and adding 28 as appropriate.  Fix a couple README.md typos.

Commit migrated from https://github.com/dotnet/corefx/commit/e4559a3ca8b32edd8f8c2c8b51ee484b2b29e01b

Using Utimes instead of utime hence setting millisecond attribute of last access and last modified time to non-zero (dotnet/corefx#31522)

* using utimes instead of utime

* Test for checking millisec attribute is set or not

* Documenting the values in case of the failure

* NanoSecond enabled

* feedback addressed

* int64_t added

* Fixing build on ci Osx(on which utimensat is not available)

* Minor nits done

Commit migrated from https://github.com/dotnet/corefx/commit/cd62bb271e98410319460b4ba48332416bcccf65

Start migration of S.S.C.X509Certificates to new Asn.1 APIs

* Read/write X509 extensions using the new ASN classes.
  * Change to accept BER, because netfx accepted it.
* Migrate AppleCertificatePal's CertificateData to new ASN classes.
* Migrate CertificateRequest to new ASN classes.
* Update PKCSdotnet/corefx#9 and PKCSdotnet/corefx#10 serialization to use new ASN.1 classes.
* Add test for normalizing zero-only serial number.
* Reimplement RSAPssX509SignatureGenerator using AsnSerializer.
* Reuse PssParamAsn from S.S.C.Pkcs.

Commit migrated from https://github.com/dotnet/corefx/commit/9853efb2db2063621a40612dc66adc06188b8778

Improve performance for GetViewBetween and enumerating TreeSubSet (dotnet/corefx#30921)

* Improve performance for GetViewBetween and enumerating TreeSubSet

* VersionCheckImpl is not called within the constructor

* count does not get updated by VersionCheckImpl

* count is now updated within VersionCheckCount which is
  only called when retrieving Count property. As a result
  count has been replaced with Count inside TreeSubSet/SortedSet
  where nessessary.

* For TreeSubSet the enumerator now uses the Count of the
  parent set (entire tree) when creating the stack.
  This results in a larger stack size, however it eliminates the
  need to get the count of TreeSubSet, which drastically
  increases the performance.

* Cleaned up code and added comments

* Fixed logic error with updateCount

* Removed unnecessary blank line

* Changed VersionCheckCount -> VersionCheck

* Cleaning code

Commit migrated from https://github.com/dotnet/corefx/commit/cc4d621fc57b5b515d6601c623337ce552ad7f86

Change arm64 build to use public VS tools instead of private toolset

Commit migrated from https://github.com/dotnet/corefx/commit/aea747d507b1c7f3587b92d158c21e4047068ece

Update BuildTools, CoreClr, CoreFx, CoreSetup to preview1-03101-02, preview1-26802-01, preview1-26802-01, preview1-26801-04, respectively (dotnet/corefx#31549)

Commit migrated from https://github.com/dotnet/corefx/commit/384cd87dbf91a21d2a2fa7c4ebb2a96b44616684

IO.Ports UAP: use GetCommPorts (dotnet/corefx#31539)

IO.Ports UAP: use GetCommPorts

Commit migrated from https://github.com/dotnet/corefx/commit/0d4ade609e2b08ee33364beccbe435040f4814cd

Expose the x86 HWIntrinsics via a set of class hierarchies matching the underlying ISA hierarchies

Commit migrated from https://github.com/dotnet/corefx/commit/e8afef97b7fc3d1c45efa467c8e71b1322c84891

Provide a desktop-only implementation of RuntimeThread.CurrentOSThreadId for Microsoft.Diagnostics.Tracing.EventSource.Redist.

Commit migrated from https://github.com/dotnet/corefx/commit/267b16e0495281e503eca0837eb30914ad973393

Add S.R.WindowsRuntime implemenation assembly into .NetCoreApp (dotnet/corefx#30761)

Commit migrated from https://github.com/dotnet/corefx/commit/724ffdee9db1c95314ca3c45f2692c2b7f73d78e

Add test helper to enable SocketsHttpHandler HTTP/2 testing (dotnet/corefx#31530)

The HTTP/2 feature is turned off by default on SocketsHttpHandler since the implementation
is not done. It can be enabled via AppContext or environment variable settings. However,
using those settings is not practical because we need a more granular way of turning on
the HTTP/2 feature for running certain tests.

This PR adds a test helper that uses reflection to set the internal _maxHttpVersion field
of SocketsHttpHandler. I also enabled one HTTP/2 test to demonstrate how to use this test
helper method.

Contributes to dotnet/corefx#31496

Commit migrated from https://github.com/dotnet/corefx/commit/2f9483cdf78c8b6319f471ccb09422a2b0248ee7

Update BuildTools to preview1-03101-01 (dotnet/corefx#31537)

Commit migrated from https://github.com/dotnet/corefx/commit/7534eddc90495eac1d7276b740367db0cd04fdc4

fix a race condition (dotnet/corefx#31437)

Commit migrated from https://github.com/dotnet/corefx/commit/07f9f7ed665d6a8e20667dd33740e810978ff523

Update CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26801-06, preview1-26801-04, preview1-26801-01, beta-26801-00, beta-26801-00, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/627d2d365c88178c161c8a5344765a569fc1f871

Update Ubuntu 18.04 build instructions

Update Ubuntu 18.04 build instructions to include OpenSSL 1.0.2 headers

https://github.com/dotnet/corefx/issues/28924#issuecomment-379889142

Commit migrated from https://github.com/dotnet/corefx/commit/89fe18fc44397309b59af62a01d5e6a8a662a2e8

correct clean -all line

correct the clean -all line

Commit migrated from https://github.com/dotnet/corefx/commit/24a41c3be54ae6fd99c4cb7870f738667c69178e

Fix buffer size in gpstream for netcoreapp20 (dotnet/corefx#31518)

* Fix buffer size in gpstream for netcoreapp20

* Bring back System.Buffers using

Commit migrated from https://github.com/dotnet/corefx/commit/43d8f38a949c8602a0cc552d1fcb5b1a0c79cae5

Remove unecessary DiagnosticUtility from Syndication code (dotnet/corefx#31184)

* Remove unecessary DiagnosticUtility from Syndication code

Commit migrated from https://github.com/dotnet/corefx/commit/8b5269680e2bf05e610ecaa2320c965007cec84e

Update CoreClr, CoreFx, CoreSetup, ProjectNTfs, ProjectNTfsTestILC to preview1-26731-07, preview1-26731-04, preview1-26731-01, beta-26731-00, beta-26731-00, respectively

Commit migrated from https://github.com/dotnet/corefx/commit/465b377e030a292616bb9e97dba733a7d17985f6

Make non-file URL support optional in XmlUrlResolver

This adds [removable feature annotation](https://github.com/dotnet/designs/pull/42) to `XmlDownloadManager`.

If the user specifies that they would like to remove support for this at publish/native compilation time, the linker/compiler is going to replace the method body of `CreateWebRequestOrThrowIfRemoved` with a throwing method body. The exception message is going to inform the user that the feature has been removed because they opted into the removal.

Contributes to dotnet/corefx#30597. Saves 1.2 MB of the size of the Windows UWP People app. This is a size on disk regression that came with NetStandard 2.0.

Commit migrated from https://github.com/dotnet/corefx/commit/5898cdd5b835fde14bb3c25c39755725de02f2b9

Add RemovableFeatureAttribute

Commit migrated from https://github.com/dotnet/corefx/commit/e5720ae475b90710586b734f149df2ded318cf73

X509Certificates2Collection.Find Ignores LRM ('\u200E') when decoding hex string

* Skip Left-To-Right-Mark (copied out of MMC) when it's the first character while parsing hex strings
* Added tests for FindByThumbprint and FindBySerialNumber

Commit migrated from https://github.com/dotnet/corefx/commit/ba505f52eb415364c1fd4f52ac00c51f37b8d125

Fix [de]serializing ASN.1 classes with default values used together with explicit tag.

* Fix deserializing ASN.1 classes with default values used together with explicit tag.
* Fix default values in PssParamsAsn not to include the explicit tags.
* Fix default values in PssParamsAsn to include explicit NULLs as per comments and RFC.

Commit migrated from https://github.com/dotnet/corefx/commit/c78053f43e4634a29eabcd6d82ff6d7589b5b120

Ported BooleanType to corefx (dotnet/corefx#31497)

Commit migrated from https://github.com/dotnet/corefx/commit/1ac5ad6d8d2ec93d81db51e727008afe038343d2

Improve GdiPlusStreamHelper to use Span stream apis and kill allocations and make it somehow faster (dotnet/corefx#31494)

* Disable drawing tests that use not implemented gdiplus apis

* Improve GdiPlusStreamHelper to use Span stream apis and kill allocations and make it somehow faster

* PR Feedback

Commit migrated from https://github.com/dotnet/corefx/commit/f563bfa8064c5b720b165ae0dc40d59d3f6b04cb

Move platform-specific pieces of `CertificatePal` into separate classes.

* Pal.OSX/CertificatePal.cs: Move `AppleCertificatePal` into its own file and add
  all static methods from `CertificatePal` to it, turning `CertificatePal` into a
  tiny proxy.

* Pal.Unix/CertificatePal.cs: Move static methods into `OpenSslCertificatePal`, then add `CertificatePal` proxy.

* Pal.Unix/OpenSslX509Encoder.cs and StorePal.cs: use `OpenSslCertificatePal` instead
  of `CertificatePal`.

Commit migrated from https://github.com/dotnet/corefx/commit/3117285369d4f4ed924751950e491bfdc47374cb

Add SocketsHttpHandler AppContext and Env variables for HTTP/2 opt-in (dotnet/corefx#31462)

The conclusion from the API review meetings was that we are not adding any
new public APIs to control MaxHttpVersion. This PR adds AppContext and
environment variable controls for opting into HTTP/2.0 support for SocketsHttpHandler.

The default for now is that max version is HTTP/1.1 unless these switches are
used. We will re-evaluate changing the default as we get closer to shipping to
determine if HTTP/2.0 support should be on by default.

Fixes dotnet/corefx#31424

Commit migrated from https://github.com/dotnet/corefx/commit/5bff639f1afd949852bc098fed27c002d5916036

Remove version increment from Dictionary<K,V>.Remove overloads (dotnet/corefx#30956)

* change tests to support safe enumeration modification operations

* change tests to support safe enumeration modification operations

* restore intrinsic changes

* fix flag comparison copy paste error

* fixing project

* Address feedback

* Address feedback, disable remove tests for 31112

* fix serialization of SortedDictionary.ValueCollection being marked possible

* remove ActiveIssue exclusions for 31112

Commit migrated from https://github.com/dotnet/corefx/commit/55fd6fed4505d65de2870988802ba642fbf3e61d

Update BuildTools to preview1-03030-01

Commit migrated from https://github.com/dotnet/corefx/commit/6dc43c7d545d6d42eb251ca8d88ef41db7d5c8ca

Reduce redundant code between S.S.C.X509Certificates and S.S.C.Pkcs

* Move X509ExtensionAsn to common source
* Move GetSubjectKeyIdentifier from Helpers directly to ManagedPal and reimplement it using X509SubjectKeyIdentifierExtension public API.
* Remove now-unused Certificate, TbsCertificateLite classes.

Commit migrated from https://github.com/dotnet/corefx/commit/a07f0c8d4efcb384c2d831c2582645098922d3ca

Add back dotnet restore to compat pack validation script (dotnet/corefx#31481)

Commit migrated from https://github.com/dotnet/corefx/commit/f15471a929e6a29d5a257f8128b59b020fb2e9a3

Skip Linq test for UWP (dotnet/corefx#31467)

Commit migrated from https://github.com/dotnet/corefx/commit/bbd8b4d67090afcf23f4f0f69e94f7cfa41a7e62