Ref T730, FSD callsign string function, addressing the "*EDDF_TWR" issue

src/blackmisc/aviation/callsign.cpp

@@ -139,6 +139,13 @@ namespace BlackMisc
                     m_callsign.at(m_callsign.size() - 1) >= 'A' && m_callsign.at(m_callsign.size() - 1) <= 'Z';
         }
 
+        QString CCallsign::getFsdCallsignString() const
+        {
+            // mainly used to fix the cross coupled callsigns such as *EDDF_TWR
+            if (m_callsignAsSet.startsWith('*')) { return this->getStringAsSet(); }
+            return this->asString();
+        }
+
         bool CCallsign::isSameAsSet() const
         {
             return m_callsign == m_callsignAsSet;

src/blackmisc/aviation/callsign.h

@@ -89,6 +89,9 @@ namespace BlackMisc
             //! Get callsign.
             const QString &getStringAsSet() const { return m_callsignAsSet; }
 
+            //! The callsign string used with FSD
+            QString getFsdCallsignString() const;
+
             //! Same as set callsign?
             bool isSameAsSet() const;