Small improvements of auto stash component

- airline can be set in model
- fallback if there is no airline, but livery code

src/blackmisc/aviation/livery.cpp

@@ -94,6 +94,13 @@ namespace BlackMisc
             return true;
         }
 
+        bool CLivery::setAirlineIcaoCodeDesignator(const QString &airlineIcaoDesignator)
+        {
+            if (m_airline.getDesignator() == airlineIcaoDesignator) { return false; }
+            m_airline.setDesignator(airlineIcaoDesignator);
+            return true;
+        }
+
         bool CLivery::hasColorFuselage() const
         {
             return m_colorFuselage.isValid();

src/blackmisc/aviation/livery.h

@@ -101,6 +101,9 @@ namespace BlackMisc
             //! Airline ICAO code
             bool setAirlineIcaoCode(const CAirlineIcaoCode &airlineIcao);
 
+            //! Airline ICAO code designator
+            bool setAirlineIcaoCodeDesignator(const QString &airlineIcaoDesignator);
+
             //! Combined code
             void setCombinedCode(const QString &code) { m_combinedCode = code.trimmed().toUpper(); }
 

src/blackmisc/simulation/aircraftmodel.h

@@ -185,6 +185,9 @@ namespace BlackMisc
             //! Airline ICAO code
             const Aviation::CAirlineIcaoCode &getAirlineIcaoCode() const { return m_livery.getAirlineIcaoCode(); }
 
+            //! Set airline ICAO code designator
+            bool setAirlineIcaoDesignator(const QString &designator) { return m_livery.setAirlineIcaoCodeDesignator(designator); }
+
             //! Airline ICAO code designator
             const QString &getAirlineIcaoCodeDesignator() const { return m_livery.getAirlineIcaoCode().getDesignator(); }