Replaced fatscape shuttle with sleeker, nicer-looking shuttle.

Added swall_floor_f5, swall_floor_f6, swall_floor_f9 and swall_floor_f10, which are smooth interior shuttle wall corners. Shuttles modified to use these instead of the blocky corners or two different overlaid turfs.

Notice board added to engineering.
Escape shuttle modified after feedback.

Wall emergency lockers now contain two breath masks and two emergency oxygen tanks.

Emergency ration crates contain two boxes of donk-pockets. The escape shuttle has two crates at the back.
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into dev
Merge pull request #4367 from RavingManiac/dev

smexy