Old Grain Mill

Changelog 1.0.0.1:
- Ramp set to ground level
- Deleted the bought with farmlands part
- Colli added

Old Grain Mill
- Price: 25000 $
- Daily upkeep: 50 $
Input: Wheat, Barley, Oat, Sorghum
Output: Flour

Storage capacity:
- Wheat: 270000 liter
- Barley: 270000 liter
- Oat: 270000 liter
- Sorghum: 270000 liter
- Flour: 30000 liter