Added atmos and jani watertanks, changed nozzle types [MAP]

* Changes hydroponics watertank backpack nozzle type to act more like a spray/mister
* Changes sprays to be used on hydro trays correctly (Interaction code for reagent_containers needs a hell of a redo)
* Added a janitorial watertank to the closet, identical to the hydro one except for colour scheme, and starts with 250 units of space cleaner.
* Added an atmos watertank with a fire extinguisher nozzle with a capacity of 100 units to cut down on moon_theme.mp4 adventures for the clown
* All three tanks can now be ordered for ten points each, with relevant access required on the crates.

You probably shouldn't let the clown get his hands on these.

Used recolours of validsalid's original sprite, done by Nienhaus:

![](http://puu.sh/7lmWq.dmi)

(This is just the .dmi from the sprites request thread, lying sprites aren't included)

Spray and extinguisher code is pretty awful, I may redo it to make them more genericised so we can easily define how a reagent container can spray out. For now I don't wish to use a chemsprayer for the janitor tank since it clears entire hallways / slips motherfuckers left and right.