Add Qt libs and headers

paho-mqtt3as-proxy/Qt/include/QtCore/qobjectcleanuphandler.h

@@ -0,0 +1,34 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QOBJECTCLEANUPHANDLER_H
+#define QOBJECTCLEANUPHANDLER_H
+
+#include <QtCore/qobject.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QObjectCleanupHandler : public QObject
+{
+    Q_OBJECT
+
+public:
+    QObjectCleanupHandler();
+    ~QObjectCleanupHandler();
+
+    QObject *add(QObject *object);
+    void remove(QObject *object);
+    bool isEmpty() const;
+    void clear();
+
+private:
+    // ### move into d pointer
+    QObjectList cleanupObjects;
+
+private Q_SLOTS:
+    void objectDestroyed(QObject *);
+};
+
+QT_END_NAMESPACE
+
+#endif // QOBJECTCLEANUPHANDLER_H