Store resources in generic inventories

tests/test_transporter_supply.gd

@@ -43,7 +43,8 @@ const CRAFTER_AT: Vector2 = Vector2(900.0, -300.0)
 func _total() -> int:
 	var sum: int = game_state.rocks + game_state.fleet_cargo
 	for b in game_state.buildings:
-		sum += int(b.get("stock", 0))
+		if b.type != GameState.BUILDING_MOTHERSHIP:
+			sum += game_state.building_resource(int(b.id), GameState.RESOURCE_ORE)
 	for t in game_state.transporters:
 		sum += int(t.get("carrying", 0))
 	# Ore inside a build that has STARTED but not finished (#23). It has left