LtsWidgets: Qt6 API fixes complete

- QComboBox::activated signal: QString→int parameter (lts_text_editor)
- qAsConst→std::as_const (5 files)
- localPos()→position() (lts_height_plot_widget)
- setMargin→setContentsMargins (tests/window.cpp)
- CMAKE_AUTOUIC OFF + include in header for MOC
- enterEvent(QEnterEvent*) signature fixes
- QRegExp→QRegularExpression replacements

All LtsWidgets module files now Qt6-compatible.

qt6-after/qt6-migrated-legatus/Lts/Common/LtsWidgets/lts_base_layout_widget.cpp

@@ -187,8 +187,9 @@ LtsBaseLayoutWidget::LtsBaseLayoutWidget(QWidget *parent, bool splitMenu)
     m_bg->addButton(m_ui->pbAfterAction, (int) ExercisePart::eAfterAction);
     m_bg->addButton(m_ui->pbSpecial,     (int) ExercisePart::eSpecial);
 
-    connect(m_bg, QOverload<int>::of(&QButtonGroup::buttonClicked), m_ui->stackedWidget, [this](int id)
+    connect(m_bg, QOverload<QAbstractButton*>::of(&QButtonGroup::buttonClicked), m_ui->stackedWidget, [this](QAbstractButton* btn)
     {
+      int id = m_bg->id(btn);
       m_ui->stackedWidget->setCurrentWidget(getToolBox((ExercisePart) id));
     });
     m_ui->pbSpecial->click();
@@ -634,7 +635,7 @@ void LtsBaseLayoutWidget::slotOperatorMenuClicked()
   operatorMenu->setTerminalButton(m_showTerminalButton);
 
   bool hasOperatorSettings = false;
-  for (const PluginData &pd : qAsConst(m_mapButtons))
+  for (const PluginData &pd : std::as_const(m_mapButtons))
   {
     if (pd.identifier == QStringLiteral("_OpmShowOperatorSettings"))
     {
@@ -1804,7 +1805,7 @@ bool LtsBaseLayoutWidget::messageIdentifierExists(const QString &identifier) con
     return true;
   }
 
-  for (const Message &m : qAsConst(m_messageQueue))
+  for (const Message &m : std::as_const(m_messageQueue))
   {
     if (m.identifier == identifier)
     {