Attempt to add fix for turtle dupe bug (ticket 286)
Added DebugInfo Command, improvements to ChunkUnloader and RPTimerSetter

- RPTimerSetter now only sets the RP tick time on startup. (fixes ticket
283)
- WorldScrubber now has a delay before triggering for the first time.
(fixes ticket 288)
- Added debug command (without help, only accessable to the console)
which lists banned and limited items.