upgrade to qt 6 compliance

app/panel/project/project.cpp

@@ -40,7 +40,7 @@ ProjectPanel::ProjectPanel(QWidget *parent) :
   // Create main widget and its layout
   QWidget* central_widget = new QWidget(this);
   QVBoxLayout* layout = new QVBoxLayout(central_widget);
-  layout->setMargin(0);
+  layout->setContentsMargins(0, 0, 0, 0);
 
   SetWidgetWithPadding(central_widget);
 

app/panel/scope/scope.cpp

@@ -36,7 +36,7 @@ ScopePanel::ScopePanel(QWidget* parent) :
   QVBoxLayout* layout = new QVBoxLayout(central);
 
   QHBoxLayout* toolbar_layout = new QHBoxLayout();
-  toolbar_layout->setMargin(0);
+  toolbar_layout->setContentsMargins(0, 0, 0, 0);
 
   scope_type_combobox_ = new QComboBox();
 

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()