Improved DungeonHelper

Completed changes so that our code uses registerDungeon() (formerly
registerCustomDungeons() ) to register all dungeons, both bundled with
the mod and custom ones. Made some changes to the code to hide
implementation details from other classes. Also, I had some problems
with old dungeons being mixed into the renamed ones. I had to remove
fallingTNThall from the schematics folder and deleted the WIP folder
because I think we have completed versions of those schematics already.

Some of our dungeons have pre-filled chests and the contents are more
generous than our current loot system (e.g. ruinsO has a prefilled
chest). I'll have to wipe all the chests later.

StevenDimDoors/mod_pocketDim/commands/CommandExportDungeon.java

@@ -132,7 +132,7 @@ public class CommandExportDungeon extends DDCommandBase
 		if (dungeonHelper.exportDungeon(player.worldObj, x, y, z, exportPath))
 		{
 			player.sendChatToPlayer("Saved dungeon schematic in " + exportPath);
-			dungeonHelper.registerCustomDungeon(new File(exportPath));
+			dungeonHelper.registerDungeon(exportPath, false, true);
 			return DDCommandResult.SUCCESS;
 		}
 		else