UHC (Ultra Hardcore)

# Changes
- Updated to Minecraft 1.21.4 / Plasmid 0.6.x
- Added DoubleRunner
- Added the Better Tools module for UHCRun
- Tweaks loots for several UHCRun modules
- Administrators can now toggle modules mid-game using the `/modules` command

# Technical Changes
- Made UHC configurations separated from game configs and data-driven
- Modified the location of many data-driven files across different UHC modes datapacks

This is the first coordinated release on GitHub, Modrinth and CurseForge.

# Code Changes
The mod now uses dynamic registries. This means that modules now support things like tags and inline fields.

# Fixes
- #8 - Timberman module has no limits

Initial release