Map Enhancements - Chemistry, Engine, HoP's Office

-Added gas sensor to core and linked to the computer in the engine room,
with sensor modified to output gas composition as well as temperature
and pressure
-Removed air alarm from core area due to it causing an instant atmos
alert and sealing the area with fire doors
-Made the core doors start bolted to prevent accidental walking into the
core room (and releasing oxygen into/cold air out of the core)
-Added general security access requirement to security dormitory doors
-Added second chem dispenser to chemistry, and adjusted positions of
other objects in room to compensate for the shift in position of the
secondary station
-Replaced one grenade casing in chemistry with an igniter to properly
balance the components without leftovers
-Moved paper bin in Head of Personnel's office to be on table beside
front desk for convenience
-Removed Mining camera computer from the Head of Personnel's office to
reflect Cargo being an entirely separate department.
Fix for Missing Lightswitch

Readded light switch to chemistry accidentally deleted in previous
commit.
Map changes relevant to Issue #10

-Added keycard authorization pad to QM's office
-Added ability to make announcements to QM request console
Further map change related to Issue #10

Fix to request console in Quartermaster's office to bring it in line
with other heads' request consoles.
Merge pull request #30 from kbernges/master

Map Enhancements to Chemistry, Engine Room, QM's office, and Head of Personnel's Office. Resolves Issue #29, map portion of Issue #10