Defined early/mid/late game DLVL intervals, which is used by dungeon theming and shaping
Fixed bug with "overlapping rooms" (was a problem with auto-feature placement not concidering the room map)
Fixed a bug where sub-rooms boundaries included the walls (now it only includes the area inside the walls, as intended)
Some "Human rooms" have carpet in them
Added functionality to randomize step choices in pathfinder (used for some corridors)
Some optimizations of the pathfinder