QmlProfiler: Replace QStringList with QString in event data

We never have multi-string event data and dragging around the list
everywhere just adds noise.

Change-Id: I4c73543464abea01d342e3f0a296ed1b05ee2a88
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qmlprofilertracefile.cpp

@@ -388,7 +388,7 @@ void QmlProfilerFileReader::processQmlEvents()
         QmlEvent &event = m_qmlEvents[eventIndex];
 
         emit rangedEvent(event.message, event.rangeType, event.detailType, range.startTime,
-                         range.duration, QStringList(event.details),
+                         range.duration, event.details,
                          QmlEventLocation(event.filename, event.line, event.column),
                          range.numericData1,range.numericData2, range.numericData3,
                          range.numericData4, range.numericData5);
@@ -428,7 +428,7 @@ void QmlProfilerFileWriter::setQmlEvents(const QVector<QmlProfilerDataModel::Qml
             QmlEvent e = {
                 event.displayName,
                 event.location.filename,
-                event.data.join(_("")),
+                event.data,
                 event.message,
                 event.rangeType,
                 event.detailType,