[Feature Request] Add option to require RST to be copied

In the normal QSO mode you are only required to copy the callsign. Once you copied the callsign you can lean back and wait for the rest of the QSO to finish and continue with the next.

It would be fun to add an option where you are also required to copy the RST. Of course, the RST should vary a bit. Mixing full numbers and cut numbers (if enabled).
