Qt 5.13 (as in Fedora 31)

In file src/state_monitor/domain_monitor_thread.h
```
#if (QT_VERSION >= QT_VERSION_CHECK(4, 7, 0))
#include <QElapsedTimer>
#else
#include <QTime>
#endif

and

#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
    QElapsedTimer        tMark;
#else
    QTime                tMark;
#endif
```