Change: Decouple and remove landscape-dependent cargo types. (#11719)

Cargo types of default engines, industries and houses are now specified in terms of label.

src/articulated_vehicles.cpp

@@ -398,6 +398,7 @@ void AddArticulatedParts(Vehicle *first)
 				rv->spritenum = e_artic->u.road.image_index;
 				if (e_artic->CanCarryCargo()) {
 					rv->cargo_type = e_artic->GetDefaultCargoType();
+					assert(IsValidCargoID(rv->cargo_type));
 					rv->cargo_cap = e_artic->u.road.capacity;  // Callback 36 is called when the consist is finished
 				} else {
 					rv->cargo_type = front->cargo_type; // Needed for livery selection