Firefighting changes:
-Firesuit level protection will not entirely protect you from being set on fire. You will gain small amounts of heat while on fire.
-Overhauls the Atmos Water Backpack into a more effective firefighting tool
-Adds a secure ATMOS closet containing said atmos water backpack to the code, but is not on the map as the backpack already exists in the ATMOS hardsuit object at this moment
Merge branch 'master' of https://github.com/tgstation/-tg-station into firefighting
Adds a new define for temperature protection for more robust firefighting gear
Adds Atmos Firesuits, Atmos Firesuit Helmets, sprites for all the firefighting gear etc
-Adds secure atmos closets to Atmos
-Removes a redundant check in water's obj reaction, add's a "cooling power" var that determines how effective it is at cooling off hotspots
-Modifies extinguishers a bit to have more options, affect more tiles, change the cooling temperature of the water inside of it, etc
-Makes the water backpack for atmos even more robust at fighting fires with a 5 tile spread, removes converting oxygen to nitrogen on Nanofrost, made the resulting end of a firefight annoying as the atmos tech would have to get an oxygen canister
-Makes racks use Move() to put objects on top of them instead of just changing the loc, in order to stop nozzles/misters from getting on them
Adds NODROP to the Atmos watertank nozzle. I have no regrets.
Merge pull request #5645 from Ergovisavi/firefighting

Firefighting changes