Fire update.  Should now burn out after a time, and temperature varies on a number of conditions.  Fixed a runtime, and made fire work in canisters.  Ingame modification of ZAS is now possible again.  Firedoors now remove duplicate firedoors on the same turf.
Napalm can now be made, due to fire changes.
fuel is now a bit less derpy.  Napalm produces volatile fuel, and less of it.  Fire consumes more welding fuel.
Compile fix.
Fix posibrain not turning off if no candidate

The reset proc was checking for the presence of a brainmob, while one
was created in the constructor. It should rather check the presence of a
key
comments out suethecake's gun due to having a weapon's ban
Merge pull request #2654 from Ravensdale/master

Custom item fix
Merge pull request #2652 from SkyMarshal/master

Fire fixes and improvements.  Note: May need fine tuning.
Add check forposibrain without brainmob

This should never happen, but check nonetheless.
Merge pull request #2653 from Jupotter/master

Fix for posibrain not turning off
Fix a wrong null check in posibrain

A wrong nullcheck that prevent posibrain searching for a player
Merge pull request #2656 from Jupotter/master

FIx posibrain unable to be started
Enabled captain's PDA from round start. Traitors, rejoice!
#2659