Minor map fixes

- Replaces Brig Medbay Door with a proper glass airlock, currently it
has a full airlock sprite but you can see through it.
- Gives disposals 2 externals airlocks instead of one, currently it's a
space sentence because of airflow.
- Adds missing window in botany backroom
More minor map fixes

- Adds 2 gas masks in the empty closet in the maint tunnel above
hydrophonics
- Re-adds the missing plasma canisters to engineering secure storage
- Adds the missing wire under the AME door
Deleted all instances of /obj/effect/byondtools/changed

Nexy you filthy mofo
Adjusts library carpet and vent

Adjusted library carpet and vent to the new front doors, no idea who
added those in the first place but you have shit taste.
Small changes to new EVA layout after feedback from the community

- Made the floor symmetrical again
- Got rid of the side doors
Re-adds an atmos hardsuit
Re-adds departmental hardsuits at Pomf's request

Same amount as before EVA change
Merge pull request #977 from Duny-/Duns_mapfixin

Minor map fixes/tweaks