move FactoryState ownership out of BuildingSystem to Simulation

src/lib/sim/Simulation.h

@@ -9,6 +9,7 @@
 #include <QPoint>
 
 #include "BeltSystem.h"
+#include "FactoryState.h"
 #include "EntityAdmin.h"
 #include "entt/entity/entity.hpp"
 #include "SchematicChoiceOption.h"
@@ -209,6 +210,9 @@ private:
     UnlockState m_unlockState;
 
     EntityAdmin                       m_admin;
+    // The factory's world data. Owned here, not by BuildingSystem, so the systems
+    // that operate on it can be handed the same state (see FactoryState.h).
+    FactoryState                      m_factoryState;
     BeltSystem                        m_beltSystem;
     std::unique_ptr<BuildingSystem>   m_buildingSystem;
     std::unique_ptr<ShipSystem>       m_shipSystem;