Map merge fixes + more

Corrects central hallway and bridge-area, re-adding vents, scrubbers, and pipes lost in recent merge (which also fixes a few disconnects).
Expands central hallway area where necessary to, for example, prevent air alarms in the captain's office to close emergency shutters in the hallway.
Removes a few lone emergency shutters by the brig. Adds emergency shutters by HoS/Sec service desks.