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/Map/location_display.h

@@ -0,0 +1,51 @@
+/**
+  * @RDE_HEADER@
+  * Interface for LocationDisplay
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+#include "situation_map_types.h"
+#include <situation_map_export.h>
+#include <QColor>
+
+//----------------------------------------------------------------------------
+namespace SituationMap
+{
+
+/**
+ * @brief The class LocationDisplay enables access to the LocationDisplay.
+ */
+class SITUATIONMAP_EXPORT LocationDisplay
+{
+
+public:
+  LocationDisplay()          = default;   ///< Contructor
+  virtual ~LocationDisplay() = default;   ///< Destructor
+
+  /**
+   * @brief setCurrentLocation
+   * @param currentLocation to be displayed
+   * @param horizontalAccuracy The horizontal accuracy in meters. Positive values or NaN are supported
+   * @param velocity The location's velocity in meters per second, 0 => no heading visible
+   * @param course The location's course in degrees (clockwise), 0 being true North.
+   * @return true on success, otherwise false
+   */
+  virtual bool setCurrentLocation(const Point3D &currentLocation,
+                                  double horizontalAccuracy = std::nan(""),
+                                  double velocity = 0,
+                                  double course = 0,
+                                  bool lastKnown = false
+                                  ) = 0;
+  virtual bool setOutdated(bool lastKnown) = 0;
+  virtual bool start() = 0;
+  virtual void stop() = 0;
+  virtual bool isStarted() = 0;
+};
+
+} // namespace SituationMap
+
+//----------------------------------------------------------------------------