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/ship_cmd.cpp

@@ -934,6 +934,7 @@ CommandCost CmdBuildShip(DoCommandFlag flags, TileIndex tile, const Engine *e, V
 
 		v->spritenum = svi->image_index;
 		v->cargo_type = e->GetDefaultCargoType();
+		assert(IsValidCargoID(v->cargo_type));
 		v->cargo_cap = svi->capacity;
 		v->refit_cap = 0;