Massive Rework of Plugin

This updates brings much safer and optimised functionality.
A lot of errors and issues have been fixed as well as new additions.

Changelog:

- Updated to work on Minecraft 1.21.4
- Reworked how databases work and should now be much simpler and easier to work with.
- Reworked how the GUI works and is much more stable and optimised.
- Reworked how the chat works when changing settings through the GUI.
- Updated the edit inventory to be able to changed all items regarding if they're disabled or not.
- Updated tab completion to be easier to work with.
- Updated some texts.
- Added a reset command to reset all or one player specifically.

Usage:

/it admin reset <player/all>

ItemsAdder compatibility will be the main focus now for the next update.