Minecraft wiki entry for Development_versions, associated text: Refactored the animation system to support hierarchical animation, and treat animations and animation controllers as 'animations'.
Updated JSON with new animation support, upgraded schema for actor definition, and included upgrades for animation controllers and actor definitions.
Converted sheep and pigs to the new animation system.
Move locators to bones.
Blend state transitions.
Removed cod lead locator.
Renamed ActorAnimation to ActorSkeletalAnimation.
Initial poly mesh support.
Added TextureMesh geometry.
Flipping data-driven entities test to enable new entities to use bind_pose_rotation.
Events now have defined data objects containing all event data.
Added new villager animations.