Fixes #4816 (or attempts to)

Creates proper instances of areas in engineering to prevent issues with APCs.
Removes one of the two APCs in the medbay sleeper area.
Corrects a few more places where atmosphere alarms would lower shutters in adjacent but otherwise unrelated rooms.
Adds a camera at the virology entrance to remove a tiny strip of missing coverage that prevented AI from assisting people in and out from viro (perhaps intended).
Light switches.. everywhere. Except main corridors..
Adds two missing APCs in medbay. Cables were in but not the units themselves. Brief tests made to check for inconsistencies.

Removes some excessive cable wiring.
Merge pull request #5036 from PsiOmegaDelta/MiscFIxes

Fixes #4816 + more