Show Missing Ingredients

Shows which ingredients are missing on a crafting bill, when viewing the bill's detail page.

Note that a pawn has to have considered the bill for it to show what's missing.
For bills with multiple possible inputs, it will list the last considered type, rather than the category, but that's enough to determine what's missing. (For example, butchering requires a corpse, but will say "missing megascarab corpse" or similar).