Bukkit

- Add Multitool and mcMMO incompatibility check
- Optimized and Fixed Modifier-Listener registration

Bugfixes:
- Fixed Anti-Arrow having the wrong Enchantment assigned
- Fixed enchantment converting
- Fixed Modifiers not craftable when ConvertEnchantsAndAttributes is turned off
- Fixed bug where Items where obtainable in GUIs because of reload
- Fixed: /mt givemodifieritem does not work if Modifier Name has a space (and other commands with same problem)
- Fixed Player won't join a server with full health if Tanky is on the armor (until reload of the server)