As of workshop RW/KB

* Allow to "jump" to text message channel from ATC / aircraft
* changed timer connections for components to new SLOT syntax
* housekeeping:
** new function in network context for station by callsign
** refactored textmessage component, allow to select tab by slot
** wired up signal / slots in main GUI
** removed unused functions
** allow to select area and "myself" in infoarea

src/swiftgui_standard/swiftguistd.h

@@ -155,9 +155,6 @@ private:
      */
     bool isMainPageSelected(MainPageIndex mainPage) const;
 
-    //! Show or hide the main Page
-    void hideMainPage(bool hide);
-
     //! Start all update timers
     void startUpdateTimersWhenConnected();