Bugfix: Adds in a check to make sure atmos code has been loaded before trying to generate, preventing some runtimes.

Tweak: Removes captain's armour from spawn code.

Tweak: Captain's PDA now spawns with messenger on but is now undetonateable.
final tweak for cap's PDA to do as advertised.
Merge branch 'master' of https://github.com/Baystation12/Baystation12

Conflicts:
	code/game/jobs/job/captain.dm
Merge pull request #2664 from Ravensdale/master

Runtime fix and two tweaks to captain items.