simplified map_spawn, now uses map_loop
removed the use of map_width/map_height
fixed crash when ent had a negative pos
removed the use of map_clamp
fixed entities not blocking when on empty-tiles
removed debug key
map can now group cells together in rooms
load map shortcut in mapeditor works again
added func to loop over all cells in the map
map groups now contains data
added map_group
entities can now breathe
rooms lose air when doors to vacuum opens