Moved tile entity classes to a separate package. Renamed some block
classes to match their in-game names (e.g. ChaosDoor -> UnstableDoor).
Moved TransientDoor to the blocks package. Cleaned up a little bit of
the code and automatically updated references to the classes that were
modified.
Renamed MobObelisk to MobMonolith. Renamed LimboSkyProvider and
PocketProvider to have Xs at the ends of their names. This is temporary
so that I can change the name's capitalization. Windows considers the
names the same because it's file naming is case insensitive.
Moved CommonTickHandler into the ticking package in preparation for the
next change. Renamed CommandStartDungeonCreation to CommandCreatePocket,
since creation pockets of variable sizes will be its future role now
that it's not strictly necessary for exporting. Renamed
CommandEndDungeonCreation to CommandExportDungeon, since we no longer
have a dungeon creation process like before.
