Add Firefighters as late-join jobs

[airconswitch]

I think the title is fairly self-explanatory. Add firefighters as a late-join job with some basic all-around access, since fire is an ever-present danger on NT facilities, and it's not like the engineering staff ever does anything about them either.

Spawning equipment would include:

• Firesuit and firefighter helm (obviously)
  
• A fire extinguisher
  
• Box of fire grenades
  
• Guaranteed oxygen bottle in box
  
• Burn first aid kit
  
• Crowbar
  

Granted, the amount of gear might be a bit generous for most late-join jobs, but consider that regional directors get an AA ID.