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_tab_widget.cpp

@@ -29,6 +29,7 @@
 #include <math.h>
 #include <QTimer>
 #include <QLabel>
+#include <QRandomGenerator>
 
 namespace LtsWidgets
 {
@@ -378,7 +379,7 @@ void LtsTabWidget::addWidget(const QString &fullName, QWidget *widget, bool setC
     QString randomString;
     for (int i = 0; i < randomStringLength; i++)
     {
-      int index = qrand() % possibleCharacters.length();
+      int index = QRandomGenerator::global()->bounded(possibleCharacters.length());
       QChar nextChar = possibleCharacters.at(index);
       randomString.append(nextChar);
     }
@@ -892,14 +893,14 @@ void CloseButton::mouseReleaseEvent(QMouseEvent *e) // only accept a click direc
   QRectF c = cross();
   QRect adjusted = QRect(QPoint(floor(c.x()), floor(c.y())), QPoint(ceil(c.right()), ceil(c.bottom() +1 /* hack */))); // be more tolerant
 
-  if (!adjusted.contains(e->localPos().toPoint()))
+  if (!adjusted.contains(e->position().toPoint()))
   {
-    //qWarning() << "NO!  release - event:" << e->localPos() << "cross:" << cross();
+    //qWarning() << "NO!  release - event:" << e->position() << "cross:" << cross();
     e->ignore();
     return;
   }
 
-  //qWarning() << "YES! release - event:" << e->localPos() << "cross:" << cross();
+  //qWarning() << "YES! release - event:" << e->position() << "cross:" << cross();
   e->accept();
   emit clicked();
 }