Survivor Pack Standardization

This rework standardizes all the survivor packs to have 25% more storage than their civilian counterparts, and adds a survivor version of the messenger bag and duffel bag to complete the set. The existing recipes were tweaked so that the amount of crafting materials and required skill increases in a predictable way at each tier of encumbrance. Oh, and none of them are fittable anymore.

MOLLE packs were nerfed because people seem to insist that the survivor gear be generally the best gear of that kind, and because they were pretty overpowered to begin with. They now have 20% more storage than the civilian counterpart, instead of 50% more storage.