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/SituationMap/MapObjectsImpl/indication_container.h

@@ -0,0 +1,115 @@
+/**
+  * @RDE_HEADER@
+  * IndicationContainer
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+// Own
+#include <Map/situation_map_types.h>
+#include <Common/situation_map_logging.h>
+
+
+// Qt
+#include <QImage>
+#include <QMap>
+#include <QVariant>
+
+
+// forward:
+namespace Esri
+{
+namespace ArcGISRuntime
+{
+class GeoView;
+class GraphicsOverlay;
+}
+}
+
+
+//----------------------------------------------------------------------------
+namespace SituationMap
+{
+
+// Forward:
+class CoordTranslationFunctor;
+class IndicationData;
+
+
+class IndicationContainer : public QObject
+{
+  Q_OBJECT
+
+public:
+  explicit IndicationContainer(const Esri::ArcGISRuntime::GeoView   *geoView,
+                               Esri::ArcGISRuntime::GraphicsOverlay *graphicsLayer,
+                               CoordTranslationFunctor              *coordTransFunctor,
+                               const UniqueMapId                    &uniqueMapId);
+  virtual ~IndicationContainer();
+
+  IndicationContainer(const IndicationContainer &other)     = delete;
+  IndicationContainer &operator=(IndicationContainer &other) = delete;
+
+  QString debugInfo() const;
+  void setDebugInfo(const QString &debugInfo);
+
+  // Marker :
+
+  virtual PositionCont positions(int idx) const;
+  virtual void setPositions(int idx, const PositionCont &positions);
+
+  virtual void setMarker(int idx, MarkerSymbolType mst, int size, const QColor &color);
+  virtual void setMarker(int idx, int size);
+  virtual void setMarker(int idx, const QColor &color);
+
+  virtual const QImage &image(int idx) const;
+  virtual void setImage(int idx, const QImage &image);
+
+  virtual void clear(int idx);
+  virtual void clearAll();
+
+  virtual int drawOrder() const;
+  virtual void setDrawOrder(int drawOrder);
+
+  virtual bool visible(int idx) const;
+  virtual void setVisible(int idx, bool visible);
+
+  virtual bool selected(int idx) const;
+  virtual void setSelected(int idx, bool selected);
+
+  virtual bool pickable(int idx) const;
+  virtual void setPickable(int idx, bool pickable);
+
+
+  virtual int getIndicationCount() const;
+  virtual QList<int> getIndicationIndexList() const;
+
+
+  virtual bool updateView();
+  virtual bool updateIndicationContainer(int idx);
+  virtual bool updateIndicationContainerPictureMarker(int idx);
+//  virtual bool updateIndicationContainerSceneMarker(int idx);
+
+public slots:
+  virtual void onThreadFinished(const QVariant &userData);
+  virtual bool onResultReady(const QVariant &userData);
+
+
+private:
+  LOGGER_T                        m_logger;      ///< Interface of the Logging-Facility
+
+  class Private;
+  /**
+      * The private d->pointer to not break BC when changing internals of this class
+     */
+  Private *d = nullptr;
+
+};
+
+
+
+} // namespace SituationMap
+