Improved hauling

[RemingtonRyder]

So, I don't know if it's a bit late for 1.0, but one of the things which is still lacking in Beta 19 is the hauling AI.

Specifically, I'm talking about haulers dragging a small amount of ingredients from a low priority stockpile to a higher priority stockpile. Because not every player builds a gigantic freezer next to their kitchen.

The RimWorld Search Agency mod does a great job of reducing this silly behaviour by adding a slider to stockpiles which controls when a cell in a stockpile needs to be refilled by haulers.

The benefit of this is that haulers can haul in other general things instead of repetitively dragging from a storage building to the kitchen storage. Outdoor deterioration can be quite pronounced when you factor in rain, and there's nothing in the hauling routine to tell haulers that some things don't react well to being left outside. Having haulers being effective while cooking is happening makes a significant difference.