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/Proxies/TrainingAreaBase/position_handler.h

@@ -0,0 +1,86 @@
+/**
+  * MainHandler for TetraRadio
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-04-14
+  */
+#pragma once
+
+#include <QObject>
+#include "main_handler.h"
+#include <LtsCoordTrans/lts_coord_trans.h>
+#include <AssetManagement/asm_dtc.h>
+#include "training_area_telegrams.h"
+
+#include "logger.h"
+
+namespace TrainingAreaBase
+{
+class PositionHandler : public QObject
+{
+  Q_OBJECT
+public:
+  explicit PositionHandler(MainHandler *mainHandler);
+
+  struct ParticipantPosition
+  {
+    TrainingAreaBase::TabPosition pos;
+    int    mountPointTypeId = 0;
+    int    buildingId = 0;
+    int    roomId = 0;
+    qint64 time = 0;
+  };
+
+  bool init();
+
+  Core::GeoPosition2D relativeToGeographic2D(const TetraIcd::RelativePosition &p) const;
+  Core::GeoPosition relativeToGeographic(const TetraIcd::RelativePosition &p) const;
+  QPointF geographicToRelativePointF(const Core::GeoPosition &p) const;
+  QPointF geographicToRelativePointF(const Core::GeoPosition2D &p) const;
+  TetraIcd::RelativePosition geographicToRelative(const Core::GeoPosition &p) const;
+  TetraIcd::RelativePosition geographicToRelative(const Core::GeoPosition2D &p, double z) const;
+  const LtsCoordTrans::UtmCoordinate &baseCoordinate() const;
+
+  // checks if position was marked as invalid by sfm (0x800000 / 0x800000)
+  static bool isPositionMarkedInvalid(const TetraIcd::RelativePosition &p)
+  {
+    static_assert(std::is_integral<decltype(p.offsetX)>::value, "RelativePosition.offsetX must be an integer!");
+    static_assert(std::is_integral<decltype(p.offsetY)>::value, "RelativePosition.offsetY must be an integer!");
+    static constexpr int invalidPos = 0x800000;
+    static constexpr int threeBytes = 0xffffff;
+    return ((invalidPos == (p.offsetX & threeBytes)) ||
+            (invalidPos == (p.offsetY & threeBytes)));
+  }
+
+  // Speed after Last Position to actual position
+  double speed(const TetraIcd::RelativePosition &relPos, const int equipNo, const qint64 timeStamp) const;
+  bool isTimeToPerformSpeedCheckExceeded(const int equipNo, const qint64 timeStamp, const int maxTime) const;
+
+  void setLastPosition(int equipNo, const  TrainingAreaBase::TabPosition &pos);
+  void setLastMountPointTypeId(int equipNo, const int lastMountPointTypeId);
+  void setLastBuildingId(int equipNo, const int lastBuildingId);
+  void setLastRoomId(int equipNo, const int lastRoomId);
+  void setLastTime(int equipNo, const qint64 time);
+  TrainingAreaBase::TabPosition lastPosition(int equipNo) const;
+  int lastMountPointTypeId(const int equipNo) const;
+  int lastBuildingId(const int equipNo) const;
+  int lastRoomId(const int equipNo) const;
+
+  bool isInTrainingArea(const TetraIcd::RelativePosition &relPos) const;
+
+private:
+  bool initCoordinateConversion() const;
+
+private:
+  MainHandler *m_mainHandler;
+  mutable std::shared_ptr<AssetManagement::Interface::Dtc> m_dtcAsm;
+  mutable LtsCoordTrans::UtmCoordinate m_utm2Geographic;
+  QHash<int, ParticipantPosition> m_lastPosition;
+
+  mutable QPointF m_relPosBottomLeft;
+  mutable QPointF m_relPosTopRight;
+
+  LOGGER_T m_logger;
+};
+} // namespace TrainingAreaBase