WIP registry rework

[aromaa]

Work in progress!

Notable changes:

• Template's have been removed.
  • Builders moved to the registry types.
  • If someone wishes, they can still serialize (if possible) the types marked as DataPackSerializable to a DataView.
• RegisterDataPackValueEvent removed
  • New types are registered directly to the registries.
    • Everything is purely runtime only and transient.
• DataPack inspection only operate as DataView, their creation and deserialization is up to the plugin authors.
• Commands now operate at the server registry layer.
  • CommandRegistrarType takes in RegistryHolder.
  • CommandTreeNodeTypes is now only available in the server layer.
    • Command.Raw#commandTree takes in RegistryHolder.
  • ResourceKeyedValueParameters remains in the game layer.
    • Parameters that require registry data can be defined using ValueParameter.Bindable.
• RegisterRegistryEvent & RegisterRegistryValueEvent improvements
  • Registries can now depend on other registries, allowing chaining.
  • RegisterRegistryValueEvent may be called multiple times in the same layer as registries are being appended.
    • Plugins wanting to modify specific registry call the #registry method and the implementation consumes the consumer if appropriate.
• Registries that have no vanilla equivalent, a Sponge one has been added in-place to iterate and add new entries.
  • Recipes
  • Advancements

Design work required:

• Replacement for WorldTemplete's to create new worlds.
• DataPack final shape is still up in the air.