Fully working brewing!

It's finished. Works entirely as intended now. Also: alcohol_strong
Sticks brew_ items in trader_avoid

just to be sure
Item tooltip for fermenting times

and does it work!
Adds portions tooltip to uncontained food.

Not sure why this wasn't here before
"Portions" tooltip for recipes with result_mult
Fully finished brewing, adds kegs as furniture

Hopefully this should be the final version of the brewing system, bar
bugfixes if needed.
Kegs act as liquid storage, with a faucet included.
Better item handling, prevents bugs

Adds NOITEM to kegs and vats, and clears non-brew items while setting
things to brew. Should prevent most bugs, you now pretty much can only
break the brewing cycle if you deliberately try.
Buildable kegs and vats

Might be issues if they're built on top of already existing stuff.
Yeast culturing!

Harvesting yeast from vats still scrapped.