Rewrote the code that changes the position of a tile entity to be
expressed in the schematic coordinate system. The new code should be
equivalent but easier to understand.
Added support for exporting tile entities as part of custom dungeons.
I've produced a schematic as a test that shows items are exported
properly and they're recognized in MCedit. I still need to add support
for loading tile entities in imported schematics.
Changed DungeonHelper.exportDungeon() to use Minecraft's NBT tag classes
instead of using JNBT. The implementation is actually slightly simpler
than our original JNBT version. I also fixed a bug in the way the
extremes of the bounding box search were calculated that caused yEnd to
have an incorrect value. Exporting works properly now. Confirmed with
tests.
Fixed the selection of boundaries for custom dungeons. The code had a
bug that would clip off a portion of dungeons during exporting. Also,
permafabric is not used to mark the edges of the dungeon anymore. That
means dungeons can contain permafabric now without getting cut off, and
the permafabric shells will be included as part of the export.
