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/libs/qmljsdebugclient/qmlprofilertraceclient.h

@@ -83,6 +83,7 @@ public:
 
 public slots:
     void setRecording(bool);
+    void setRecordingFromServer(bool);
     void clearData();
     void sendRecordingStatus();