Bukkit

Corrected (hopefully not broken) some possible thread issues.

Added a limit to how many blocks can re-spawn at once to 1000 blocks to lessen possible lag from it.

Added some handling of frames and painting. Basically those events will be cancelled in regions. So players won't be able to place, destroy, or modify frames/paintings. In editor mode you should be able to place and edit, but not remove - couldn't find a way to get a player name for destroy event, only see cause, which is just an enum.