bug fixe around serelization of items (armor and off hand slots, nbt tags error)
created command class, Class.java and ClassCommand.java for future of add of classes ig.
⚠ havn't tested at all, probably not working great, gonna make some update on it this week.
want to make a better system for custom mobs.
optimized imports with idea.
- create item with yml files.
- preparing for CustomModelData and custom ressource pack handeling (somewhat like oraxen hosting rp)
- error with Scoreboard.java need to search how to update a score.
