Libs: Add *tr.h file

Change-Id: I827d3bc1fd24cf2e3fb6dbe9d255f12cc91cd409
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/libs/modelinglib/modelinglibtr.h

@@ -0,0 +1,15 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include <QCoreApplication>
+
+namespace ModelingLib {
+
+struct Tr
+{
+    Q_DECLARE_TR_FUNCTIONS(ModelingLib)
+};
+
+} // ModelingLib