On the next episode of DD: Brotherhood

Reorganize code
	Rewrite metadata rotation code
	Separate schematic importing and exporting from other functions
	Refactor import/export code to remove redundancy
	Move common constants and version-dependent constants to isolated files

Load built-in dungeons using same method as custom dungeons
Switch to using tag-named dungeons
Fix dungeon vertical clipping
Limit SchematicLoader to only loading dungeons with proper dimensions
Finish fixing commands
Fix Wooden Dim Doors popping loose at random* (hard to reproduce)
Fix rifts appearing off-center for dd-rift with non-North-oriented rooms* (rift voodoo involved)
Fix Limbo decay* (<.< permanently, Steven!)
Look into possible world leaking* (unicorn hunt)
Implement support for track and log metadata rotations*

Implement dungeon pack system** (must consult Steven)
Implement configurable dungeon chain system** (should have dungeon packs first)
Implement new save format** (potentially deadly...)

Review block materials and properties*** (low priority)
Complete a riddle dungeon*** (as promised)
Patch dd-rift crash*** (rare bug I noticed)
Add support for GenerateStructures = false*** (low priority)
Stop superflat worlds from crashing*** (low priority)
Make rifts destroy blocks in layers*** (low priority)
Make rifts destroy blocks in layers*** (low priority)
Update to MC 1.6*** (after everything else)


Loose ends:
Do something with trapdoor blocks
Consider retrogeneration suggestion
Consider double-doors suggestion
--There are probably other things I've overlooked