Pet Frogs and More!

Re-implementation of the animation system, improving stability and solving a lot of bugs from the previous version.

Known Issues!

• some entities have animations that no longer work on their baby variant due to the 26.1 tiny takeover update. They can have separate animations, but (afaik) the models have not been ported to Blockbench yet, so I can't easily rework the animations for the baby versions.
• Sulfur Cubes the block inside of them cannot be animated. This is the same problem that the Mooshroom runs into, as it's an actual BlockModel, which does not have the same render pipeline that allows for animating.