Additional airlock vents in outpost airlocks

Cycling the outpost airlocks should no longer take forever.
Connects one of the airlocks to a near empty air-canisters instead of the local air supply, should ensure the vents have to work less.
This solution not available for the station itself. Requires too much power.
Merge remote-tracking branch 'upstream/master' into OutpostAirlock
Merge pull request #6346 from PsiOmegaDelta/OutpostAirlock

Additional airlock vents in outpost airlocks