Coop fixes and other things

Updates

1. Chorus fruit setting added
2. Coop player fixes
3. Players can leave the team in the new Nether as well as the Overworld.
4. Admin register command will work in the new nether to register players to the nether island as home.
5. Added tab complete for admin register command.
6. Added option to disable obsidian scooping
7. API: New event fires when ASkyBlock is fully loaded.
8. Chat prefixes are now in the config.yml
9. Updated Dutch locale file and fixes in English locale to add missing challenge navigation string.