Datagen most things that can be and some general code sweeps

[GizmoTheMoonPig]

This PR adds the following to datagen:

• the rest of the blockstate jsons
• all loot tables
• conditional recipes for crates
• damage types (mod only has one currently)
• configured and placed features
• biome modifiers
• loot modifiers
• pack.mcmeta file

I did a lot of testing and comparing files and everything should work as it did originally.

This PR also includes some general cleanups, including removing unused imports, field finalizing, removing unnecessary casts, and a few other small logic cleanups.

Please let me know if anything doesnt look right to you and I will happily change it as needed.