Map changes

-Addition of a new Mechanics workshop
-Janitor's closet moved to north of Delivery Office allowing them easy
access to disposals and delivery
-Maintenance changes (because some of the shit I changed 6 months ago
was retarded) including a widening of lots of one tile wide tunnels e.g.
around dorms and north of atmos.
-other misc changes like making the warehouse door two tiles wide,
changing R&D so the desk doesn't look out at escape and adding a small
storage room to toxins lab for antaggery