Added backwards support (kinda, it needs to be looked at again since it probs don't work)
Added two behaviours for MainRoomDoorwayGroup. The original behaviour (RemoveGroup) and the new (SetInOrder)
Alternate main path's initial depth is set to the MainRoomTile's depth + 1 instead of always 1
DevDebugWindow now uses the retry counter outside of Application.IsEditor
Make some collections deserving to be readonly, to be readonly
List within lists contrast a bit better
StringBuilder instead of list of strings
Added dungen's generation stats to debug window
