Add Asset system

- Add Abstract Asset class which defines Assets
- Add AssetManager class to keep track of all the Asset
- Add AssetFile class to cache the asset without loading it
- Add UUID class to uniquely identify assets
- Add MetaFile class to load meta asset files

CopiumEngine/src/copium/util/RuntimeException.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <stdexcept>
+
+namespace Copium
+{
+	class RuntimeException
+	{
+  private:
+    std::string errorMessage;
+	public:
+    RuntimeException(const std::string& str);
+
+    const std::string& GetErrorMessage() const;
+	};
+}