Add spriter animation, imp download from https://github.com/treefortress/SpriterAS. [ci skip]
Add XAnimation2D class. name is temporary, I will name it to Animation2D laster. [ci skip]
Add animation set class. [ci skip]
Add XAnimatedSprite2D class.[ci skip]
Add spriter animation sample in C++.
Fixed text format.[ci skip]
Make XAnimatedSprite2D derived from Drawable, export attributes.
Add XAnimationSprite icon and XAnimationSet picker in editor.[ci skip]
Add spriter animation AS binding and sample.
Add Spriter animation Lua binding and sample.
Add hot spot in Sprite.
Update 24_Urho2DSprite sample with spriter animation.
Remove old GoldIcon animation.[ci skip]
Remove old AnimatedSprite2D and Animation2D.h.
Rename XAnimation2D to Animation2D
Rename XAnimationSet2D to AnimationSet2D, Rename XAnimatedSprite2D to AnimatedSprite2D.
Add tips. [ci skip]
Add bone animation support.
Fixed build hierarchy. current these is a bug for scaling.
Move parent from Mainline to Timeline.