Feature/uts2 legacy 1pass stereo rendering (#108)

* Added capability of handling single pass stereo rendering.

* Bumped Unity versions to 2019.4.31f1. Updated the shader only package and removed imageEffect packages.

* Added Initialzation in UCTS_DoubleShadeWithFeather.cginc and UCTS_ShadingGradeMap.cginc.

* works on 2020.3.

* Applied fix in other shaders to UCTS_Outline.cginc and UCTS_Outline_Tess.cginc.

* Made the tessllation shaders ready for shadowmaps.

* Updated the shader only package for 2.0.9-preview

* Preparation for 2.0.9 release. Updated the value of _UTS2VersionNumber to 2.09f in UTS2GUI.cs.

* Updated version number to v.2.0.9 in *.shader and *.cginc files.

* Removed unsupported post-process components from Main Camera in each scenes and Fixed links in the documentation.

* Updated shader files in documentation and target environment for sample scenes. Delete unnecessary files.

* Updated .gitignore

* Added Packages/manifest.json. Fixed .gitignore file.

* Update .gitignore

Co-authored-by: toshiyuki mori <toshiyuki@unity3d.com>

Author: Nobuyuki-Kobayashi

.gitignore

@@ -5,6 +5,8 @@
 [Bb]uilds/
 [Uu]nityPackageManager/
 Assets/AssetStoreTools*
+[Ll]ogs/
+[Uu]serSettings/
 
 # Visual Studio cache directory
 /.vs/
@@ -33,4 +35,7 @@ ExportedObj/
 sysinfo.txt
 
 # Builds
-*.apk
+*.apk
+
+# Unity 2019.4.x or later
+Packages/package-lock.json