[NUI] Sync dalihub and Samsung TizenFX (#338)

[NUI] Sync dalihub and Samsung TizenFX (#338)

* Added LayoutGroup and LayoutItem classes in NUI.

This was done by using bindings wrapper classes for LayoutItem,
LayoutGroup, LayoutMeasureSpec, LayoutLength, and LayoutMeasuredSize.

Change-Id: I19e28bdff59a62cf1c8e8711f50f9f0e8f1c119a

* Layouting support in NUI

Change-Id: I3d6f688d869faa81c34385db37feceb1d8c1d0c0

* Fixed disposed bug and removed RegisterChildProperties API usage.

Change-Id: I7b71bd1a3a03306897abdf3c263c6bbb65c1bff8

* RootLayout added to Window

Change-Id: Ie47ceec452b5f254950263bdaf661e9e3fe86d1f

* All Layers have an Absolute layout

Change-Id: I08281a25b2b73822b45f5c6a567b574b5af74fb4

* Set View.Size2D sets layout minimum size if exists.

Change-Id: Ide73c78957d9ee5d4799bfff4aa2232b87ffa536

* [NUI] Minimize public api for xaml

Change-Id: Ib1426b1956a2af307bd6128d6b97067b0d732847

* Renaming of rootlayer in Layer.cs

Change-Id: I583f49caaad819cabaca83b09c9c7dd9c2b9a331

* Fix NUI nested layout issue

Change-Id: I68edd6cf8295e06a52655d84b8ce039a4e1f1008

* [NUI] Back-sync Samsung/TizenFX into dalihub/TizenFX

Change-Id: Ib63e792bc3474c9226506f30889994219e237ec1

* [NUI] Remove tabs and redundant spaces

Change-Id: I1d512d7f478e532f76629b2529995386820fc764

* Sync dalihub/TizenFX and Samsung/TizenFX

- [NUI] Remove apis which are using internal APIs (#324)
  Some apis are using DALi internal APIs.
  Clean up these wrong apis to prevent future errors.
  Signed-off-by: minho.sun <minho.sun@samsung.com>
Change-Id: I77f773ec84f93f69684c2bdad26d9721f8ed705d
Signed-off-by: dongsug.song <dongsug.song@samsung.com>
* Sync dalihub/TizenFX and Samsung/TizenFX for NUI-XAML related changes

Change-Id: Ied6a4e33d462712672e65763572c6aa88065a897
Signed-off-by: dongsug.song <dongsug.song@samsung.com>
* Support multi-cascade property setting for Size2D and Position2D

Change-Id: Ibeb9e9ec639742b78054fe8592167170ea0f00d2
Signed-off-by: dongsug.song <dongsug.song@samsung.com>
* Add Mouse button type to identify clicked button kind

Change-Id: Id336dacccff8192a17cda552ba8ea2ba01121002
Signed-off-by: dongsug.song <dongsug.song@samsung.com>