Mobs and Entities Part 1 (Sheep, Cows, Pigs, Chickens, Mooshrooms, Squids)

[ThisIsBrady]

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This PR is the first of a (probably very long) series where I'll be adding entities. This one adds Sheep, Cows, Pigs, Chickens, Mooshrooms, and Squids and sets up interfaces to accommodate future mobs.

All mobs are fully poseable via the Entities Tab. Some mobs have more specific customization available in the Entities tab:

• Sheep can be recolored and sheared/unsheared
• Pigs can be Saddled
• Mooshrooms' mushrooms can be hidden and their Variant can be changed.

Built from #1719 Related to #41

[leMaik]

Should we merge this without waiting for all mobs to be implemented? :thinking:

Chickens and cows (maybe more?) now have different temperature variants and the textures were renamed. That's probably something that could be addressed in this PR (at least add the 25w06a+ snapshot's path to the texture; eg. entity/chicken.png -> entity/chicken/temperate_chicken.png).

Edit: The cow and chicken variants seem to have different models, so adding them is probably something for a future PR.

[ThisIsBrady]

Yeah, that'd be fine with me. I'm traveling this weekend, then should have a bit of time next week to get back to this. I've been away on work travel for several months but am headed back now.

[ThisIsBrady]

Converting back to draft until I get the pig and chicken variants completed

[ThisIsBrady]

~~New variants are all added. Should be ready for merge now,~~ and I'll start more mobs for another PR.

Disregard. Sheep and Mooshrooms are broken.

[ThisIsBrady]

Now it's ready xD

[leMaik]

This is awesome :tada: Can't wait for more mobs to be implemented.