Fix Ref leak when using Godot getters

include/core/Ref.hpp

@@ -199,6 +199,15 @@ public:
 
 		unref();
 	}
+
+	// Used exclusively in the bindings to recreate the Ref Godot encapsulates in return values,
+	// without adding to the refcount.
+	inline static Ref<T> __internal_constructor(Object *obj)
+	{
+		Ref<T> r;
+		r.reference = (T*)obj;
+		return r;
+	}
 };
 
 }