Qt6 Migration: Complete migration with DDS/RTI support and build validation

Major Changes:
- Merged latest Qt5 devel content from dlbo (292 files changed, 7 new dirs)
- Consolidated forward-declarations and include folders
- Removed unneeded modules per Niklas' repo check list

Build System Fixes:
- Fixed CMake VERSION_GREATER syntax in ParticipantManagement/CMakeLists.txt
- Added VLC packages (libvlc-dev, vlc-plugin-base) to docker_build.sh
- Added PostgreSQL dev packages (libpq-dev, postgresql-server-dev-all) to Dockerfile
- Fixed locale warnings (ANSI_X3.4-1968 → C.UTF-8)
- Fixed ArcGIS SDK path warnings when BUILD_ARCGIS=OFF

Code Generation Fixes:
- Fixed IDL enum collisions (PortType→CorePortType/DdsutPortType, PdmEventType)
- Fixed Grantlee template svc_translation.cpp.grantlee:
  - Changed {{ idl_enum.name }}_def:: to {{ idl_enum.name }}::
  - Fixed .underlying() calls for C++11 scoped enums (enum class)
- Removed generated files from repo (moc_*, *_dtc.h, *_ftc.h)

Validation:
- BUILD_RTI=ON: SUCCESS
- BUILD_RTI=OFF: SUCCESS
- C++17 standard maintained for RTI 7.7 compatibility
- Ubuntu 26.04 Docker environment verified

Remaining Warnings (expected):
- BgViewer, KDChart, KDReports, Poppler-Qt6 not found (optional features)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt5-before/dlbo/Lts/Common/LtsWidgets/lts_tab_bar.cpp

@@ -0,0 +1,125 @@
+/**
+* @RDE_HEADER@
+* TabBar with special stylesheet settings
+* $Id$
+* $HeadURL$
+* $Author$
+*/
+
+#include "lts_tab_bar.h"
+
+#include "lts_dialog.h"
+#include "lts_dialog_helper.h"
+#include "lts_events.h"
+#include "lts_tab_widget.h"
+
+#include <TabBarTabStyle/tab_bar_tab_style.h>
+#include <QCoreApplication>
+#include <QMenu>
+
+namespace LtsWidgets
+{
+
+LtsTabBar::LtsTabBar(bool isSecondary, QWidget *parent)
+  : QTabBar(parent)
+  , m_secondary(isSecondary)
+{
+  setDocumentMode(true);
+  setTabsClosable(true);
+
+  connect(this, &LtsTabBar::currentChanged, this, &LtsTabBar::updateCloseButtonColors);
+
+  if (m_secondary)
+  {
+    connect(this, &LtsTabBar::customContextMenuRequested,
+            this, &LtsTabBar::onCustomContextMenuRequested);
+    setContextMenuPolicy(Qt::CustomContextMenu);
+  }
+}
+
+
+void LtsTabBar::_internal_closeTab() // Do not use.
+{
+  QObject *object = sender();
+  int tabToClose = -1;
+
+  for (int i = 0; i < count(); i++)
+  {
+    if (tabButton(i, QTabBar::RightSide) == object)
+    {
+      tabToClose = i;
+      break;
+    }
+  }
+
+  if (tabToClose != -1)
+    emit tabCloseRequested(tabToClose);
+}
+
+
+void LtsTabBar::updateCloseButtonColors(int newIndex) // as this does not happen automatically
+{
+  // tell all buttons if there are selected or not
+  if (newIndex == -1)
+    newIndex = currentIndex(); // TODO: is currentIndex already set when emitting currentChanged ??
+
+  for (int i = 0; i < count(); i++)
+  {
+    QWidget *w = tabButton(i, QTabBar::RightSide);
+    CloseButton *cb = qobject_cast<CloseButton *>(w);
+
+    if (!cb)
+      continue;
+
+    QColor text;
+
+    bool enabled   = isTabEnabled(i);
+    bool selected  = (i == newIndex);
+    bool secondary = m_secondary;
+
+    if (enabled)
+    {
+      if (selected)
+        text = (secondary) ? Styles::TabBarTabStyle::secondarySelected : Styles::TabBarTabStyle::primarySelected;
+      else
+        text = (secondary) ? Styles::TabBarTabStyle::secondaryNormal : Styles::TabBarTabStyle::primaryNormal;
+    }
+    else
+      text = (secondary) ? Styles::TabBarTabStyle::secondaryDisabled : Styles::TabBarTabStyle::primaryDisabled; // no 'selected' on disabled!
+
+    //qWarning() << "("<<i<<")"<<text<<text.isValid();
+    cb->setFontColor(text);
+  }
+}
+
+void LtsTabBar::onCustomContextMenuRequested(const QPoint pos)
+{
+  if (!m_secondary)
+    return;
+  QMenu m;
+  QAction *a = new QAction(tr("Save as image"));
+  connect(a, &QAction::triggered, this, [this, pos]() { LtsTabBar::onSaveCurrentWidgetAsImage(pos); });
+  m.addAction(a);
+  m.exec(mapToGlobal(pos));
+}
+
+void LtsTabBar::onSaveCurrentWidgetAsImage(const QPoint pos)
+{
+  int curTab = tabAt(pos);
+  if (curTab < 0)
+    curTab = currentIndex();
+  if (curTab < 0)
+    return;
+  LtsTabWidget *tw = qobject_cast<LtsTabWidget*>(parentWidget());
+  QWidget *w = tw ? tw->widget(curTab) : nullptr;
+  if (!w)
+    return;
+  LtsDialogHelper *helper = qobject_cast<LtsDialogHelper*>(w);
+  if (helper)
+    w = helper->getDialog();
+  SaveImageEvent *ev = new SaveImageEvent(w, w->grab());
+  ev->setAccepted(false);
+  QCoreApplication::postEvent(qApp, ev);
+}
+
+} // namespace LtsWidgets