VanillaDisable

Remove some JiJ'd libraries

• Write own code for gamerule registration on all platforms, ditch fabric-gamerule-api on fabric
• Write own code for keybind registration on all platforms, ditch fabric-key-binding-api on fabric
• Switch worldgen config from .toml to .properties (ditch toml4j), and implement migration -> new global config toggle for chat message when new worldgen features are added

Create new worldgen config menu for the world creation screen

• Easier to configure worldgen rules
• Remove old menu; remove global config toggle for old menu

Create mixin config class only once; fix number of mixin overrides being logged twice