Reorganized UnityEngine namespace

Reorganized UnityEngine namespace by splitting headers into individual classes

lib/private/UnityEngine/Camera.cpp

@@ -0,0 +1,8 @@
+#include "pch-il2cpp.h"
+
+#include "UnityEngine/Camera.h"
+
+app::Camera* Camera::GetMainCamera()
+{
+	return app::Camera_get_main(nullptr) ? app::Camera_get_main(nullptr) : nullptr;
+}