upgrade to qt 6 compliance

app/panel/timebased/timebased.cpp

@@ -29,6 +29,11 @@ TimeBasedPanel::TimeBasedPanel(const QString &object_name, QWidget *parent) :
 {
 }
 
+TimeBasedPanel::~TimeBasedPanel()
+{
+  delete widget_;
+}
+
 rational TimeBasedPanel::GetTime()
 {
   return widget_->GetTime();

app/panel/timebased/timebased.h

@@ -32,6 +32,8 @@ class TimeBasedPanel : public PanelWidget
 public:
   TimeBasedPanel(const QString& object_name, QWidget *parent = nullptr);
 
+  virtual ~TimeBasedPanel() override;
+
   void ConnectViewerNode(ViewerOutput *node);
 
   void DisconnectViewerNode()