refs #316 Changed blackcore to use CLogMessage to emit messages.

Also changed functions which always returned CStatusMessageList containing a single CStatusMessage,
to return CStatusMessage instead for simplicity.

src/blackcore/context_ownaircraft.h

@@ -34,6 +34,9 @@ namespace BlackCore
         Q_CLASSINFO("D-Bus Interface", BLACKCORE_CONTEXTOWNAIRCRAFT_INTERFACENAME)
 
     public:
+        //! Log message category
+        static QString getMessageCategory() { return "swift.context.ownaircraft"; }
+
         //! DBus interface name
         static const QString &InterfaceName()
         {