Proposal: native registry API

[drtheodor]

The why

Instead of doing custom registries like modkit does right now, we could use MC's built-in registry system. This would give us a lot of benefits like stability and speed, as well as native support for all the registry shenanigans.

The how

Obviously, this means that the registry elements will lose GSON support, opting for Codecs instead.

First, we need to inject into RegistryLoader#DYNAMIC_REGISTRIES list field. Registry's element's codecs can be whatever, but referencing registry elements in other registry element codecs is better to do via RegistryElementCodec, as seen in DimensionType and DimensionOptions.

[duzos]

i like it but have no clue on how to do it
if you could make a branch mayhaps..

[drtheodor]

TODO:

• Custom RegistryLoader.Entry's getLoader implementations for default and custom ids
• A more convenient Identifier constructor for the registry builder