ClamWin.conf preservation

Many of the portable apps launchers hang around until the app launched exits in order to do cleanup work. I think it would be helpful if the PortableClamWin launcher did this in order to manage ClamWin.conf. The idea would be to copy Data\ClamWin.conf to App\clamwin\bin\ClamWin.conf at startup (if it exists), and then at exit copy it back the other way. That way users (I) don't have to manaully save that file aside when upgrading.