QmlProfiler: Move event handling into model manager

This is the logical place to do it. Adding the event first to the QML
model and then passing it back to the manager in order to have it
dispatched to the other models is somewhat backwards.

Change-Id: I64b1cb38f97331b62d83fa5ae49b9b2690810d40
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/plugins/qmlprofiler/tests/qmlprofilerbindingloopsrenderpass_test.cpp

@@ -48,10 +48,8 @@ DummyModel::DummyModel(QmlProfilerModelManager *manager) :
 
 void DummyModel::loadData()
 {
-    QmlProfilerDataModel *dataModel = modelManager()->qmlModel();
     QmlEventType type(MaximumMessage, Binding);
-
-    dataModel->addEventType(type);
+    modelManager()->addEventType(type);
 
     for (int i = 0; i < 10; ++i) {
         QmlEvent event(i, 0, {});