QmlProfiler: Move parts of model manager and trace file to Timeline

This way we can use the trace file loading and saving mechanism for
other profilers.

Change-Id: I98ec1cdde6f7abcea152cabf72e64d4e696dfa59
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qmlprofiler/qmlprofilerrangemodel.cpp

@@ -103,6 +103,8 @@ void QmlProfilerRangeModel::finalize()
 
     if (supportsBindingLoops())
         findBindingLoops();
+
+    QmlProfilerTimelineModel::finalize();
 }
 
 void QmlProfilerRangeModel::computeNestingContracted()