Facility items 002 - chemicals [WIP]

Adding some basic chemicals for the facilities and  few assorted recipes. Including the powerful ANFO charge used in mining.

Also adds a stackable_resources.json for storing (potentially) all the stackables that are used for crafting and not for shooting - will trim down the melee.json and ammo.json a bit if allowed to.

Tested everything and stuff works quite nicely. The explosion of the ANFO charge is deadly if you muck about instead of getting out of the (relatively big) blast radius. Pretty happy with the results. As usual, any and all comments / suggestions are well-appreciated !