refs #413 Make all value class methods non-virtual.

toCVariant() and convertFromCVariant() are now deprecated,
use CVariant::from() and CVariant::to() instead.

src/blackmisc/network/clientlist.h

@@ -40,7 +40,7 @@ namespace BlackMisc
             CClientList(const CSequence &other);
 
             //! QVariant, required for DBus QVariant lists
-            virtual QVariant toQVariant() const override { return QVariant::fromValue(*this); }
+            QVariant toQVariant() const { return QVariant::fromValue(*this); }
 
             //! Register metadata
             static void registerMetadata();