Re-add the Fix ConcurrentModificationException while being idle kicked in a vehicle patch
Alter BungeeCord support to require BungeeCord when it is enabled.
Allow the potion effect caused by WitherSkulls to be cancelled along with damage cancellation (e.g. via events).
Optimize Player Lookup - #112

Optimize player lookup and various player operations. We mainly do this by keeping a map instead of iterating through all players. We also speed up the duplicate login check and a few other checks by simply checking for one matching player.

Thanks @aikar for some of the implementation
Change various "Nope!" kick messages to something more descriptive and less confusing for players.