Added NetworkPage;
- some settings fields moved from MiscPage to NetworkPage;
- new entries in SettingsWindow;
- VatsimDataHandler honors user caching settings;
- added stdout mutex for logging.
Added StatsPurveyor class.
Removed unneeded var
Added QJson dependency, stats response handling
Added reporting missing ATC callsigns
Honoring user's settings.
Added LetSendStatsDialog.
Changelog update