Recurrent Complex Volts

- Added an `Auth -> Loot` GUI for creating and editing RC inventory generators.
- Added `/rc loot` commands.
- Added support for assigning vanilla/datapack loot table IDs to container markers.
- Added an `Auth -> Tools` page for quickly getting the Selector, Floating Selector, and Inspector.
- Added a config/GUI/command toggle for disabling bundled structures in default RC worldgen.
- Added Create/vanilla `.nbt` schematic import support in the Schems workflow.
- `.schem`, `.schematic`, and `.nbt` schematics can now be previewed and converted to RC structures.
- Improved Create schematic compatibility, including better handling for Create blocks such as waterwheels.
- Schematic conversion now defaults the new RC structure ID to the schematic name.
- Added `structures/inactive` support for keeping structures installed but ignored.
- Fixed several GUI layout and paging issues.