user settable per-item global hauling priority

[matthiaskrgr]

In some situations (lets say we just harvested a HUGE field of cloth) I'd love to be able to set hauling-priority on a per-item bases (let's say cloth gets hauled first, even before foods and meals etc) to prevent it from rotting or having to manually tell colonists to haul the cloth one by one (which is quite a PITA to be honest).

It could look similar to this (screenshot from Settlers 2)
http://images.eurogamer.net/2013/articles//a/1/7/2/6/1/2/3/Settlers_2_problem.png/EG11/resize/600x-1/quality/80/format/jpg
on the right side of the screen you have the different item pictures and simply moving them up or down changes the priority (upmost preverred by carriers first)