stockpiles: import from disk and write to memory
stockpiles: fix male/female creature mat lookups
stockpiles: add missing protobuf field
stockpiles: allow loading without file extension
stockpiles: fix quality unserialization
stockpiles: handle furniture sand_bags field
stockpiles: fix finished goods quality
stockpiles: make gem other mats more robust
stockpiles: handle animal cages and prepared meals
stockpiles: animals list still shown even when disabled
stockpiles: overwrite existing files
stockpiles: handle all metals and stones