DeadEnding Microsoft.CSharp and Bumping Version for System.Runtime.CompilerServices...

DeadEnding Microsoft.CSharp and Bumping Version for System.Runtime.CompilerServices.Unsafe (#2354)

* Dead Ending Microsoft.CSharp Package and Bumping the leftout assembly versions to 5.0.0.0 (#2264)

* deadending Microsoft.Csharp Package and bumping the assembly versions

* retargeting and clean up

* Update Microsoft.CSharp.csproj

* fixing the build

* reference -> projectreference

* adding ignored reference

* removing package references and making R2rDump bin place to a specifc output directory

* remove package reference from R2r dump as well

* adding comment and targeting netstandard2.0

* adding back package references for netstandard lib build

* adding back baseline version for consistency