Add set animtion to AnimatedSprite2D in editor, fixed minor bug in ParticleEmitter2D.
Fixed storing of sound resource names in SoundEffects Lua example (setting arbitrary properties on UIElement did not work.)
Fix attribute network replication for AnimatedSprite2D.
Don't use unit per pixel in ParticleEmitter2D.
Rename "Unit Per Pixel" attribute in Drawable2D to "Pixels Per Unit" to match the actual behavior in StaticSprite2D / AnimatedSprite2D. Remove the attribute from ParticleEmitter2D class as it doesn't have effect. Closes #230.
Set PixelsPerUnit default value to 100, make 2D Object has suitable size in Editor.
Revert "Set PixelsPerUnit default value to 100, make 2D Object has suitable size in Editor."

This reverts commit 766ce1d4c106feb289a9d7338e2f2fd81dad14e8.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Bin/Data/LuaScripts/14_SoundEffects.lua
	Source/Engine/LuaScript/pkgs/Urho2D/Drawable2D.pkg