V2 new features

New features

1. v1 uses only one scml for all Spriters. v2 can now set a scml when creating a Spriter with addSpriter. If you don't set the scml, it will use the default scml set in the SpriterEngine parameters.
2. New macro that serializes your scml(s) to save parsing time in your app
3. Reverse : Play your animation backward
4. Reflect : Play your animation forward/backward
5. flip by inverted scale
6. Compilations flags

Bug fixes and improvements

1. The scml is no longer cloned for each Spriter(less allocations). All current state data of the animation is moved from the scml to the Spriter.
2. less allocations by reusing static instances (SpatialInfo and TimelineKey)
3. fix sub entities time