Backport project

[jackburkhardt]

This is just a checklist of features implemented for the 1.16 version that need to be backported to 1.8.

• [x] Setting disableMobSpawning during arena load
• [x] Disabling hunger with foodLevelChangeEvent
• [x] Setting keepInventory during arena start
• [ ] Moving commands out of main and adding tab complete (this isn't done in 1.16 yet either)
• [ ] Changing health label
• [x] Better fireball handling
• [x] Fixing autostart bug
• [x] New versioning system?
• [ ] Better bed system (if it works)