Standartized definitions.
Changes to airlock opening:
-Only people with engineering access can open them by hand.
-Crowbarring them open/close now takes some time (~3 sec)
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into lockdown

Conflicts:
	code/game/machinery/doors/firedoor.dm
Merge pull request #3725 from comma/lockdown

Lockdown