Adds the ability to inject chemicals into the atmospherics pipeline thro...

...ugh the following methods:

* Inject into canister and release
* Inject into canister and hook into a loop
* Inject into canister and transfer into an internals tank
* Inject into canister and share between canisters

Adds an industrial sized 'injector' to the atmospherics closets to facilitate dispersion of chemicals into the air-stream.

Plasma, Fuel and Thermite in the air will add to the flammability of the air, but not neccesarily ignite it.

99.5% of chemicals can be dispersed, and will react as intended, including viruses, acid, slime toxin, alcohol etc.
* A known "issue", but not exactly an issue, is that explosive reactions (EMP,Potassium etc) will be small.
Unless you changed it after our testing injector doesnt change the mode to draw after you injected it 
Its inconvinient to click it every time you injected something to change the mode to draw again