Add crafting/production via Dwarf Fortress-like workshops

[Mikolaj]

But probably with just one turn spent producing, because the time-management mini-game with workshops is boring. Represent the difficulty of crafting in some other way.

[Mikolaj]

I think LambdaHack should remain a squad roguelike and this feature is out of scope, so I'd implement it as the LH engine extension and not add it to the engine codebase. Let's see how modular we are...