Splits silage production into crop-specific variants.

Forage harvester output:
- Grass → Grass Chaff (CHAFF_GRASS)
- Wheat, Barley, Oat, Triticale, Rye, Sorghum → GPS Chaff (CHAFF_GPS)
- Maize → Chaff (vanilla, unchanged)

Bunker silo fermentation:
- CHAFF_GRASS → Fermented Grass (grass silage)
- CHAFF_GPS → Fermented GPS (whole crop silage)
- CHAFF → Silage (vanilla corn silage)

The grain is now in its final growth phase and can be harvested into swaths which can be processed into GPS silage using a forage harvester and pickup.

The knife function in forage wagons and balers allows the material to be picked up from grass and processed into grass chaff.

Forage wagons now compact the material picked up via the pickup in the loading area.

All fermented types work with mixer wagons, animal feeding, and selling points.
Multiplayer compatible.