enable adding custom config widgets from a run control factory

To achieve this there are two methods in IRunControlFactory you
need to implement:

1) createRunConfigurationAspect returns a IRunConfigurationAspect
which stores the settings specific to your plugin.
2) createConfigurationWidget returns a RunConfigWidget that will
be shown in the project settings

Merge-request: 258
Reviewed-by: hjk <qtc-committer@nokia.com>

src/plugins/debugger/debuggerruncontrolfactory.h

@@ -65,7 +65,7 @@ public:
 
 private:
     QString displayName() const;
-    QWidget *createConfigurationWidget(RunConfiguration *runConfiguration);
+    ProjectExplorer::RunConfigWidget *createConfigurationWidget(RunConfiguration *runConfiguration);
 
     const unsigned m_enabledEngines;
 };