Player Animation Library

BREAKING CHANGE: The library now takes avatars instead of players and is able to animate them. (including mannequins)
Fixed various bugs with custom pivot points.
Fixed GeckoLib format bezier and smooth keyframes causing issues with begin/end tick.
Fixed crash with NPCs that have skins.
Fixed cape animations.
Fixed legacy binary write issue with items.
Fixed first-person animation visibility conflict with Iris Shaders. (Thanks to ZsoltMolnarrr)
Fixed possible crash after calling the getAnimationTicks method of the AnimationController.
Added toString overrides to various library classes.