Add Qt libs and headers

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

@@ -0,0 +1,26 @@
+// Copyright (C) 2020 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 QQUEUE_H
+#define QQUEUE_H
+
+#include <QtCore/qlist.h>
+
+QT_BEGIN_NAMESPACE
+
+
+template <class T>
+class QQueue : public QList<T>
+{
+public:
+    // compiler-generated special member functions are fine!
+    inline void swap(QQueue<T> &other) noexcept { QList<T>::swap(other); } // prevent QList<->QQueue swaps
+    inline void enqueue(const T &t) { QList<T>::append(t); }
+    inline T dequeue() { return QList<T>::takeFirst(); }
+    inline T &head() { return QList<T>::first(); }
+    inline const T &head() const { return QList<T>::first(); }
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUEUE_H