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/qmlprofileranimationsmodel.cpp

@@ -102,6 +102,7 @@ void QmlProfilerAnimationsModel::finalize()
     computeNesting();
     setExpandedRowCount((m_maxGuiThreadAnimations == 0 || m_maxRenderThreadAnimations == 0) ? 2 : 3);
     setCollapsedRowCount(expandedRowCount());
+    QmlProfilerTimelineModel::finalize();
 }
 
 int QmlProfilerAnimationsModel::rowFromThreadId(int threadId) const