CtfVisualizer: Do some cleanup

Remove unused headers.
Use using namespace and drop unneeded namespace scopes.
Replace QVector with QList.
Return default constructed objects in default return statements.
Avoid empty arg brackets in some lambdas.
Use default member initializers.

Change-Id: I11e62a291be3fa5bde4156e7a316765ee697b852
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/ctfvisualizer/ctftimelinemodel.cpp

@@ -8,16 +8,12 @@
 #include "ctfvisualizertr.h"
 
 #include <tracing/timelineformattime.h>
-#include <tracing/timelinemodelaggregator.h>
-#include <utils/qtcassert.h>
 
-#include <QDebug>
+#include <utils/qtcassert.h>
 
 #include <string>
 
-
-namespace CtfVisualizer {
-namespace Internal {
+namespace CtfVisualizer::Internal {
 
 using json = nlohmann::json;
 using namespace Constants;
@@ -46,7 +42,7 @@ QVariantList CtfTimelineModel::labels() const
 {
     QVariantList result;
 
-    QVector<std::string> sortedCounterNames = m_counterNames;
+    QList<std::string> sortedCounterNames = m_counterNames;
     std::sort(sortedCounterNames.begin(), sortedCounterNames.end());
     for (int i = 0; i < sortedCounterNames.size(); ++i) {
         QVariantMap element;
@@ -190,7 +186,7 @@ void CtfTimelineModel::finalize(double traceBegin, double traceEnd, const QStrin
     m_rows = computeRows(&m_maxStackSize);
     ++m_maxStackSize; // index -> count
 
-    QVector<std::string> sortedCounterNames = m_counterNames;
+    QList<std::string> sortedCounterNames = m_counterNames;
     std::sort(sortedCounterNames.begin(), sortedCounterNames.end());
     m_counterIndexToRow.resize(m_counterNames.size());
     for (int i = 0; i < m_counterIndexToRow.size(); ++i) {
@@ -376,7 +372,5 @@ const QString &CtfTimelineModel::reuse(const QString &value)
     return *it;
 }
 
-
-} // namespace Internal
-} // namespace CtfVisualizer
+} // namespace CtfVisualizer::Internal