Adds a "Unit Conversion" section to the Game Settings tab in the pause menu.

Choose your preferred units for:
- Liquid: Liters or US Gallons
- Crops: Liters, Bushels (grains) or Lbs (root crops / other solids)
- Weight: Kg / Tonnes or Lbs / US Tons
- Measurement: Meters / Centimeters or Feet

Converts the shop list, vehicle configuration screen (capacity, fuel, methane, working width, bale sizes), in-game HUD fill levels, prices menu storage, and info boxes. Fill types are classified individually: grains show bushels, liquids gallons, dry bulk lbs / US tons, and bales or pallets keep their piece counts.

Settings are saved per-profile and persist between game sessions.
Does not affect in-game prices or game mechanics — display only.