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/Services/AudioVideoManagement/exercises_handler.h

@@ -0,0 +1,104 @@
+/**
+  * Exercises Handler - checks the avilable exercises and creates subhandlers fort each of them
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-04-14
+  */
+#pragma once
+
+#include <AudioVideoManagement/avm_db.h>
+#include <ExerciseManagement/exm_enums.hpp>
+#include <QtCore/QObject>
+#include <QtCore/QTimer>
+#include <map>
+#include <memory>
+
+namespace ExerciseManagement
+{
+
+class Exercise;
+
+namespace Interface
+{
+class Dtc;
+}
+
+} // namespace ExerciseManagement
+
+
+enum class DataModification;
+
+
+namespace AudioVideoManagement
+{
+
+class ExerciseHandler;
+class ExerciseContext;
+class AudioVideoHandler;
+class MainHandler;
+class AssetAssignmentManager;
+
+class ExercisesHandler : public QObject
+
+{
+  Q_OBJECT
+public:
+  explicit ExercisesHandler(MainHandler *mainHandler);
+  ~ExercisesHandler();
+
+  bool init();
+
+  ExerciseHandler *exerciseHandler(int exerciseId) const;
+  AudioVideoHandler *audioVideoHandler(int exerciseId) const;
+
+signals:
+  /**
+   * @name Signals that notify a state change regarding the notion of whether the
+   * context is active or not.
+   * A context is considered active when the corresponding excercise has one of the
+   * following states: Started, Paused, Resumed.
+   * The state can only change from activated to deactivated but not back.
+   */
+  ///@{
+  void contextActivated(const ExerciseContext &context);
+  void contextDeactivated(const ExerciseContext &context);
+  ///@}
+
+public slots:
+  /**
+   * Triggers AVS to reload the DeviceConfig after 1s unless called again within that time.
+   * The avDbReloadNeeded() signals of the following entities will be connected here:
+   * - ExerciseHandler
+   * - AudioVideoHandler
+   * - ImportHandler
+   * - TvcHandler
+   * - CnrHandler
+   */
+  void onAvDbReloadNeeded();
+
+private:
+  void createExerciseHandlerFromLastSeen(const Database::AvmExerciseLastSeen &lastSeen);
+  ExerciseHandler *getOrCreateExerciseHandler(int exerciseId);
+  ExerciseHandler *createExerciseHandler(int exerciseId);
+
+  void exerciseModified(int exerciseId, const ExerciseManagement::ExerciseState &state);
+
+  DatabaseInterface *db();
+  ExerciseManagement::Interface::Dtc *exmDtc();
+
+private slots:
+  void onExerciseChanged(const ExerciseManagement::Exercise &data, DataModification modType);
+  void exerciseFinished(int exerciseId);
+
+private:
+  MainHandler                              *m_mainHandler;
+  QTimer                                   *m_triggerAvUpdateTimer;
+  std::unique_ptr<AssetAssignmentManager>   m_assetAssignmentManager;
+
+  class ExerciseParts;
+  std::map<int, ExerciseParts>   m_exercises;
+
+  NGL::INGLLogger &m_logger;
+};
+} // namespace WarehouseManagement