Qml run controls automatically stop all run controls for the same file

That's something which has been asked for multiple times. Also related
to the task below.

Change-Id: I1130a2a3527479f18bde2abfbff28fb556f437b9
Task-Nr: QTCREATORBUG-3508
Reviewed-on: http://codereview.qt.nokia.com/1844
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprojectmanager/qmlprojectruncontrol.h

@@ -55,6 +55,8 @@ public:
     virtual bool isRunning() const;
     virtual QIcon icon() const;
 
+    QString mainQmlFile() const;
+
 private slots:
     void processExited(int exitCode);
     void slotBringApplicationToForeground(qint64 pid);
@@ -65,6 +67,7 @@ private:
 
     QString m_executable;
     QString m_commandLineArguments;
+    QString m_mainQmlFile;
 };
 
 class QmlProjectRunControlFactory : public ProjectExplorer::IRunControlFactory {