Add GetWorld to Actor. Integrate google test. Add Model manager class. Rename *.h to *.hpp files

Core/Game/GameInstance.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <atomic>
+#include <memory>
+
+class CoreInstance;
+class World;
+
+#define GENERATE_FACTORY_GAME_INSTANCE(Class) \
+GameInstance* GameFactory(CoreInstance& core) { return new Class(core); }
+
+class GameInstance
+{
+	CoreInstance& core;
+	World* world = nullptr;
+
+	std::atomic<bool> is_running = true;
+
+	void start();
+	// Stop call from core
+	void stop();
+public:
+	// Stop call from game
+	void quit();
+
+	// Init vulkan
+	GameInstance(CoreInstance& core);
+	virtual ~GameInstance();
+
+	World* GetWorld() const { return world; }
+	CoreInstance& GetCore() const { return core; }
+
+	friend class CoreInstance;
+};