ProjectExplorer: Implement RunConfiguration::do{Clone,Restore} in base

It's possible now.

Change-Id: I49ed73312aea1627a9543890431e2e379e3fb3ec
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/ios/iosrunconfiguration.h

@@ -73,7 +73,7 @@ signals:
 
 private:
     friend class ProjectExplorer::IRunConfigurationFactory;
-    void initialize(Core::Id id);
+    void initialize(Core::Id id) override;
 
     void deviceChanges();
     friend class IosRunConfigurationWidget;