Add Qt libs and headers

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

@@ -0,0 +1,25 @@
+// 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 QSTACK_H
+#define QSTACK_H
+
+#include <QtCore/qlist.h>
+
+QT_BEGIN_NAMESPACE
+
+template<class T>
+class QStack : public QList<T>
+{
+public:
+    // compiler-generated special member functions are fine!
+    void swap(QStack<T> &other) noexcept { QList<T>::swap(other); } // prevent QList<->QStack swaps
+    void push(const T &t) { QList<T>::append(t); }
+    T pop() { return QList<T>::takeLast(); }
+    T &top() { return QList<T>::last(); }
+    const T &top() const { return QList<T>::last(); }
+};
+
+QT_END_NAMESPACE
+
+#endif // QSTACK_H