Misa's Realistic

[1.20m]
-Added new cow and mooshroom models with custom baby variant and new animations.
-Reworked all 13 cow/mooshroom textures to use new models
-Added new rare cow variant that most commonly spawns in flower and mushroom-themed biomes.
-Temporarily removed cow blink animations until they can be remade for new textures.
-Removed some unused textures.