Fixed all remaining memory leaks. Fixes #969, Fixes #919

* Fixed bug with inventory flag not being set properly when using RP2
containers.
* Removed initOverWorld and cleaned up loadAllWorlds. Fixes #411
* Prevent forge chunk providers from creating bukkit generators.Fixes #976
* Add null check before attempting to unload a world.
* Re-fixed issue #120 with inventory pickups not being seen after death.
* Fixed Flans weapon box dupe when using placement event.
* Removed simulate-block-place-event check and config option. Fixes #247
, #436, #456, #471, #796.
* Removed old mystcraft code.