refs #319, added column formatters

* Specialized formatters (e.g. for bool, for PQs etc.) allow specialized look and feel for each column
* Fixed isValidComFrequency used for formatters
* Changed models to use formatters
* Outdated propertyByIndexAsString methods removed
* During the above tasks: fixed override keyword in some places
* Column tooltips
* refs #323, wrong column name fix

src/blackgui/models/atcstationlistmodel.h

@@ -43,6 +43,9 @@ namespace BlackGui
             //! Set station mode
             void setStationMode(AtcStationMode stationMode);
 
+            //! Station mode
+            AtcStationMode getStationMode() const { return this->m_stationMode; }
+
         public slots:
             //! Used to quickly update single station (better response for the user)
             void changedAtcStationConnectionStatus(const BlackMisc::Aviation::CAtcStation &station, bool added);