QmlProfiler: manage server-side start tracing message

also
QmlProfiler: refactor eventlist state

If unexpected data is received, assuming server stopped profiling.
Also, introducing a eventlist state instead of relying on
signals sent around.  This is part of a coming bigger patch
where the profiler client is refactored.

Change-Id: Ibed9007903956daf03cc0fcb90f77b5ad2d3cf90
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qmlprofilertool.h

@@ -78,6 +78,7 @@ public slots:
 
     void startRecording();
     void stopRecording();
+    void recordingButtonChanged(bool recording);
     void setRecording(bool recording);
 
     void setAppIsRunning();
@@ -106,6 +107,7 @@ private slots:
     void showLoadDialog();
     void showErrorDialog(const QString &error);
     void retryMessageBoxFinished(int result);
+    void eventListStateChanged();
 
 private:
     void connectToClient();