Works with falsewalls and plasma asay logs.

Removed a spawn() from the Destroy() proc of falsewalls.
Removed the falserwall type, now reinforced walls are a subtype of falsewalls.
Due to that, removed a bunch of copypasted code.
Falsewalls now spawn closed.
Falsewalls open/close timers are now proper, regarding their animation times.
You can't use a screwdriver on falsewalls while they aren't on a floor. (excluding shuttle floors)
Fixed #2338
Plasma falsewalls will now ignite.
Added a feedback message when you don't have enough sheets to create a falsewall.
Admin logs for igniting plasma walls, falsewalls, doors and airlocks.
Stadarized mineral_doors.dm.