Custom Difficulty option: Additional preparation required for Ship exploration

Add a new difficulty option that will make it so that the Ship needs additional supplies before exploring.
These can include:
Crew Food for Crew (Early Game: Potatoes, Mid Game: Food Packs, Late Game: Crew Supplies)
Ammunition (Early: Standard Rounds: Coal + Sulphur + Steel, HE Rounds: Standard Rounds + NH3, AP Rounds Standard Rounds + Depleted Uranium)
Optional: Mechanical Parts/Vehicle Parts ⇒ speed + damage resistance buff

I think it could be tied to difficulty:
- Sailor: Fuel only
- Captain: Fuel + Food
- Admiral: Fuel + Food + Vehicle Parts