Disc Plow 3DR And 4DR v1.1.0.0

Changelog v1.1.0.0:
- Updated store icon
- Tidy working depth
- Wrote the 4-disc model.

Disc plow 3DR
- New: 10.000 €
- Used: 5.000 €
Working Speed: 18 Km/h
Required Power: 78 HP
Working Width: 2.0 M

Disc plow 4DR
- New: 14.000 €
- Used: 9.000 €
Working Speed: 18 Km/h
Required Power: 102 HP
Working Width: 2.5 M