Mo' Bends

Built on the same engine as 2.0.0-alpha.3 for Minecraft 1.21.1 (mobends-core 2.0.0-alpha.3).

Added

• Animators and model definitions can tell the Minecraft versions apart with core:minecraft_version ({"core:minecraft_version": [">", "1.12.2"]}), and model definitions can change with them through @variants: a list of an @when and the fields it merges into the definition when that holds. One pack can then fit 1.12.2 and the later versions alike.
• A box's face in a model definition can be mirrored with "flip": true.

Changed

• The wolf matches vanilla: its head, legs and tail sit and turn where vanilla's do, a pup's head is where vanilla puts it, and its mouth follows the head.
• The first-person hand is always vanilla's arm and sleeve, posed as vanilla poses them, never bent.
• Breaking: the renderer.firstPersonRest key of model definitions is gone, with the bent first-person hand it posed.