1.21.1 support

NMS Update + various minor changes
https://github.com/Mantic-Development/ManticLib/releases/tag/1.0.48.0

1.21 Supports & Bug Fixes

Configurability, Gui fix & other internal changes

NMSLib update and other internal changes.

Added the ability to use custom sounds, refer to https://docs.mantic.dev/welcome#how-can-i-use-custom-sounds-from-my-texture-resource-pack

Support for 1.20.4 (for the lib and other Mantic plugins - can be found in our discord). Removed offline tab complete tab and added Enchant Fix for 1.20.4.

Skull rework for newer mc version.

Glow Enchant bug fix, nbt api update & version bump