Facility items 003 chemicals (reprise) [WiP][CR]

Using the discussion from https://github.com/CleverRaven/Cataclysm-DDA/pull/9215 I've put up a tiered system for chemicals and populated it with the first batch of chemicals and a nice bomb to keep things interesting.

In total, I am planning some 30 chemicals (15 out of the way already, 10 more shortly) and some 20 devices (among them: Thermite, RDX, HMTD, TCAP, Powder charge, Hexamine, Smoke curtain, Rocket Candy, Home-made rocket).

Please comment on what do You think of these ideas and tell me if there is something obvious, that I should add to the list.
Hi, I'm KA101 the Fun Killer, and I'm here to kill your fun name for the homemade rocket launcher there because it's the same as the FO3 gun, yet doesn't do the same thing.

Thus folks can complain both that we're lazily using the same name as a commercial-game item, and that we're confusing 'em because it doesn't do the same thing.  "survivor's rocket tube" would be an acceptable name, and I'm sure there are others.