QmlProfiler: Track requested, recorded, and displayed features

This way we can have a central filter menu to hide and show features
in any connected views.

Change-Id: I8142da0062a23f8166555016de6c7cb38060f725
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilertimelinemodel.cpp

@@ -44,6 +44,8 @@ QmlProfilerTimelineModel::QmlProfilerTimelineModel(QmlProfilerModelManager *mode
 {
     connect(modelManager, &QmlProfilerModelManager::stateChanged,
             this, &QmlProfilerTimelineModel::dataChanged);
+    connect(modelManager, &QmlProfilerModelManager::visibleFeaturesChanged,
+            this, &QmlProfilerTimelineModel::onVisibleFeaturesChanged);
     announceFeatures(1ULL << m_mainFeature);
 }