0.3.5

- fixed canceling workshop constructions leaving job sprites behind
- show stair orientation when digging stairs down
- fixed creatures and gnomes flashing when on the same tile
- reworked the workshop gui
- stockpiles: initial suspend threshold per item is now 0, if it's 0 the suspend threshold is ignored
- fixed some items not possible to stockpile - please report if an item doesn't appear in the stockpile filter