Merge pull request #2951 from meyar/master

Emergency fix: Nuke shuttle
Stops air alarm masters from polling each alarm every tick. Now polling occurs only when alarm danger level changes.
Fixes #2915
Merge pull request #2953 from comma/master

For for air alarms and bots
Missing sprite for EMT jacket.
Various things can be carried on hazard vests and EMT jackets. Code for #2932.
gitignore, why don't you work?
Fixes radium not producing cures for virus2.
Minor tweaks to spawning medical clothes.
Minor tweaks to medical clothes to match descriptions.
Fixing a misclick.
Merge pull request #2956 from comma/master

Virus fix
Merge pull request #2955 from Segrain/master

Medical clothes.
Fix issue causing depressurization of all shuttles.

@cib, you made all unsimulated tiles appear to be the size of a room, but neglected to also increase the apparent volume of gas in said "room."
Merge pull request #2960 from SkyMarshal/patch-2

Fix issue causing depressurization of all shuttles.
Fixes disposals ending up in security.
SHOULD fix chemistry being excluded from the delivery loop.
Mail should be functional again.