Added Hobo Cooking Barrels.
Added a check for existing Charcoal. So basically, if the furnace/fire/etc. already has Charcoal it will not save space for another Charcoal slot.. Best example is if you had a cook fire and within it you had (1) stack of charcoal, (1) stack of meat, (1) stack of wood (so you have 2 open slots).. if you tried to add more meat it wouldn't fill one of the two open slots because it would think it needs room for (1) charcoal stack and (1) cook meat stack.
In short.. this will now fill one of those two slots!