VanessaE suggested a sit animation, so add one to the player. Not used by default, but many mods might find this handy
Add support for hats, so that MineCraft skins using this feature are compatible
Fix the death animation looping while the player is dead, by using a still frame instead (I don't believe the amount of detail for a full animation is needed anyway). Also call the animation Lay instead of Death, so other mods like beds can use it
Fix positioning for sit animation