Ref T259, Ref T243 automatically update client gnd. capability by situation

Rational: If we receive a gnd flag from network, the client does have this capability

src/blackmisc/network/clientprovider.h

@@ -19,6 +19,7 @@
 
 namespace BlackMisc
 {
+    namespace Aviation { class CAircraftSituation; }
     namespace Network
     {
         //! Direct in memory access to client (network client) data
@@ -61,6 +62,10 @@ namespace BlackMisc
             //! \threadsafe
             int removeClient(const Aviation::CCallsign &callsign);
 
+            //! Adjust gnd.flag capability from situation
+            //! \threadsafe
+            bool autoAdjustCientGndCapability(const Aviation::CAircraftSituation &situation);
+
         private:
             CClientList m_clients;
             mutable QReadWriteLock m_lockClient; //!< lock clients: m_clients