[unity] Added 'SpriteMask and RectMask2D' example scene to demonstrate mask setup.

CHANGELOG.md

@@ -186,6 +186,7 @@
 		by e.g. the LWRP renderer, leading to incorrect draw order (e.g. "A1 B A2" changed to "A1A2 B").
 		You can leave this parameter disabled when everything is drawn correctly to save the additional performance cost.
   * **Additional Timeline features.** SpineAnimationStateClip now provides a `Speed Multiplier`, a start time offset parameter `Clip In`, support for blending successive animations by overlapping tracks. An additional `Use Blend Duration` parameter *(defaults to true)* allows for automatic synchronisation of MixDuration with the current overlap blend duration. An additional Spine preferences parameter `Use Blend Duration` has been added which can be disabled to default to the previous behaviour before this update.
+  * Additional `SpriteMask and RectMask2D` example scene added for demonstration of mask setup and interaction.
 
 * **Changes of default values**
   * `SkeletonMecanim`'s `Layer Mix Mode` now defaults to `MixMode.MixNext` instead of `MixMode.MixAlways`.

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