Support butchery items that have roll formula instead of just a fixed quantity

[Muttley]

Ex. Deathclaw has 2dc portions of Deathclaw Meat

[FeyFatale]

In addition to this: Several creatures have non food items that can be butchered, such as flamer fuel or even drinks like irradiated blood. I'm assuming the tab is locked since I can't drag anything other than food specifically, and if I click 'add' it won't actually add the item I put in - it only functions when I specifically drag a food item onto list.

EDIT: It apparently was adding the stuff in, it just put it in the salvage tab, even though it's part of butchery. It might be worth collapsing those into a single tab?