Add Director, director::CommandList, hk::Goal and fixups

* Simulator and Director are no longer singletons.

hcore/include/simulator/simulator.h

@@ -7,24 +7,15 @@ namespace simulator {
 
 class Simulator {
 public:
-    Simulator(const Simulator&) = delete;
-    void operator=(const Simulator&) = delete;
-
-    static Simulator& instance()
-    {
-        static Simulator instance;
-        return instance;
-    }
-
-    void initialize();
-    void loadScene(scene::Scene::Id sceneId, scene::Scene &scene);
-
-private:
     Simulator() = default;
     ~Simulator() = default;
 
-    scene::Scene::Id sceneId;
-    scene::Scene scene;
+    void initialize();
+    void loadScene(Scene::Id sceneId, Scene &scene);
+
+private:
+    Scene::Id sceneId;
+    Scene scene;
 };
 
 }