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/Viewer/LtsDataView/test.cpp

@@ -0,0 +1,103 @@
+/**
+  * @RDE_HEADER@
+  * Test for LtsDataView and their AbstractDisplayWidgets
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Mike Wille, SLSE, 2016-03-14
+  */
+
+#include "test.h"
+
+#include <lts_data_view.h>
+
+#include <QApplication>
+#include <QDebug>
+#include <QLabel>
+#include <QStandardItem>
+#include <QStandardItemModel>
+#include <QElapsedTimer>
+#include <QScrollArea>
+#include <QScroller>
+
+
+Disp::Disp()
+  : LtsDataView::AbstractDisplayWidget(nullptr)
+  , m_label(new QLabel(this))
+{
+
+}
+
+
+bool Disp::init(const QModelIndex &idx)
+{
+  if (!idx.isValid())
+    return false;
+
+  m_label->setText(rowData(idx, 0).toString());
+  return true;
+}
+
+
+int main(int argc, char **argv)
+{
+  QApplication app(argc,argv);
+
+  int rows = 20;
+  int cols = 7;
+
+  QElapsedTimer et;
+  et.start();
+  qWarning() << "creating" << rows << "items";
+  qWarning() << "wait..";
+
+  LtsDataView::LtsDataView *view = new LtsDataView::LtsDataView();
+
+  QStandardItemModel model;
+
+  for (int r = 0; r < rows; r++)
+  {
+    for (int c = 0; c < cols; c++)
+    {
+      QStandardItem *item = new QStandardItem(QStringLiteral("Item %1/%2").arg(r).arg(c));
+      model.setItem(r,c,item);
+    }
+  }
+
+  view->setModel(&model, [](){ return new Disp(); });
+  view->show();
+
+#ifdef TABLET_MODE
+  auto widget = view;
+  if (widget)
+  {
+    widget->setAttribute(Qt::WA_AcceptTouchEvents);
+
+    {
+      QScrollArea *sca = qobject_cast<QScrollArea *>(widget);
+      if (sca)
+      {
+        qWarning() << widget << "is scroll area";
+        QScroller::grabGesture(sca->viewport(), QScroller::LeftMouseButtonGesture);
+        QScroller::grabGesture(sca, QScroller::LeftMouseButtonGesture);
+      }
+      else
+      {
+        QAbstractItemView *aiv = qobject_cast<QAbstractItemView *>(widget);
+        if (aiv)
+        {
+          qWarning() << widget << "is abst. item view";
+          QScroller::grabGesture(aiv->viewport(), QScroller::LeftMouseButtonGesture);
+          QScroller::grabGesture(aiv, QScroller::LeftMouseButtonGesture);
+          aiv->setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
+          aiv->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
+        }
+      }
+    }
+  }
+#endif
+
+  qWarning() << "took" << et.elapsed() << "ms";
+
+  return app.exec();
+}