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

Core/Game/Resource/IResource.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string>
+
+#include "RTTI_Meta.h"
+
+GENERATE_META(IResource);
+class IResource
+{
+public:
+    virtual std::string serialize() = 0;
+    virtual void deserialize(const std::string& data) = 0;
+};