Subtype compatibility

[Psither]

• Adds a way to track registered subtypes and changes required methods to save and sync your current subtype.
• All main dragon types have the same name subtype as type by default, and are registered as subtypes of themselves.
• You can extend existing dragon types and define your own subtype's name, and then you can register them as a subtype that shares cosmetics and passives.
• Active abilities now check your subtype, while passives and innates use a copy of the main type. Because all normal types are now sub-types of themselves, this won't change your abilities. Subtypes also share the wing effect.
• Updates the /dragon command to read subtypes so you can use it to transform freely into subtypes.
• The save data now saves and checks subtype instead of type, if it is present in the save data, for compatibility with older saves.
• The claw and skin systems still use the main type.

Tested out pretty thoroughly on local, plus some testing done on network.

[BlackAures1]

Thanks for working on this! Tell me, how urgently do you need this in the public domain? I'm just on holiday at the moment.

[Psither]

I'm still working on the modpack, but it's almost done. It still doesn't have pixel art for the abilities, but blocks, particles, sounds, effects, etc. are all present.

I'm just busy with bugfixes, it'll be ready for full release soon, albeit with some placeholder artwork.