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/ppm_handler.h

@@ -0,0 +1,46 @@
+/**
+  * Listen to EquipmentExerciseMapping telegrams from PPM
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2018-06-18
+  */
+#pragma once
+
+#include <ParticipantManagement/ppm_dtc.h>
+#include <unordered_map>
+#include <unordered_set>
+#include "logger.h"
+
+class QTimer;
+namespace TrainingAreaBase
+{
+class MainHandler;
+
+class PpmHandler final : public QObject
+{
+  Q_OBJECT
+public:
+  explicit PpmHandler(MainHandler *mainHandler);
+
+  bool init();
+
+  std::shared_ptr<ParticipantManagement::Interface::Dtc> getDtc() { return m_ppmDtc; }
+  std::unordered_map<int, std::unordered_set<int>> exerciseEquipmentAssignment() const { return m_exerciseEquipmentAssignments; }
+
+Q_SIGNALS:
+  void position(int equipNo, const ParticipantManagement::ParticipantPosition &pos);
+
+private Q_SLOTS:
+  void onParticipantPositionChanged(const ParticipantManagement::ParticipantPosition &data, DataModification modType);
+  void onEquipmentExerciseMappingChanged(const ParticipantManagement::EquipmentExerciseMapping &data, DataModification modType);
+  void sendEquipmentExerciseAssignment();
+private:
+  std::unordered_map<int, std::unordered_set<int>> m_exerciseEquipmentAssignments;
+  std::shared_ptr<ParticipantManagement::Interface::Dtc> m_ppmDtc;
+  MainHandler *m_mainHandler;
+  QTimer *m_equipExerciseMappingTimer;
+
+  LOGGER_T m_logger;
+};
+}