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/HighLevelArchitecture/Guez/main_handler.cpp

@@ -0,0 +1,124 @@
+/**
+  * MainHandler for HighLevelArchitecture
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2017-04-07
+  */
+
+#include "main_handler.h"
+#include "ngs_handler.h"
+#include "web_socket_handler.h"
+#include "Common/identifierstruct.h"
+
+#include <QCoreApplication>
+#include <QTimer>
+#include <Common/settings.h>
+#include <Common/logger.h>
+#include <DDS/Core/pacemaker.h>
+
+namespace HighLevelArchitecture
+{
+
+MainHandler::MainHandler(QObject *parent)
+  : QObject(parent)
+  , m_exerciseId(0)
+  , m_logger(getLogger("MainHandler"))
+{}
+
+MainHandler::~MainHandler()
+{
+  m_ngsHandler = nullptr;
+  m_ddsHandler = nullptr;
+}
+
+bool MainHandler::init(int domainId, int exerciseId)
+{
+  m_exerciseId = exerciseId;
+  IdentifierStruct::setOwnSiteId(exerciseId);
+  // initialize DDS
+  m_ddsHandler = std::make_shared<DdsHandler>(domainId, exerciseId);
+  if (!m_ddsHandler->init())
+  {
+    ERROR_LOG(m_logger) << "Could not init DDS handler";
+    return false;
+  }
+  connect(m_ddsHandler.get(), &DdsHandler::exerciseHlaStateChanged,
+          this, &MainHandler::onExerciseHlaStateChanged);
+
+  onExerciseHlaStateChanged(m_ddsHandler->hlaIsActive());
+
+  m_ddsHandler->pacemaker()->setNewState(Core::RunningState::Running);
+  return true;
+}
+
+bool MainHandler::isConnectedToHla() const
+{
+  return m_ngsHandler && m_ngsHandler->isConnectedToHla();
+}
+
+void MainHandler::onExerciseHlaStateChanged(bool bHlaEnabled)
+{
+  NOTICE_LOG(m_logger) << "HLA State Changed: HLA is now " << (bHlaEnabled ? "EN" : "DIS") << "ABLED in this exercise";
+
+  if (bHlaEnabled)
+  {
+    if (m_ngsHandler && m_wsHandler)
+      return;
+
+    if (!m_wsHandler)
+    {
+      m_wsHandler = std::make_shared<WebSocketHandler>(m_exerciseId, this);
+      if (!m_wsHandler->init(Settings::webSocketListenPort()))
+      {
+        m_wsHandler = nullptr;
+        return;
+      }
+    }
+
+    if (!m_ngsHandler)
+    {
+      m_ngsHandler = std::make_shared<NgsHandler>();
+      connect(m_ngsHandler.get(), &NgsHandler::ngsHandlerReady,
+              m_wsHandler.get(), &WebSocketHandler::sendHlaConnectionState, Qt::UniqueConnection);
+      if (!m_ngsHandler->init(m_ddsHandler))
+      {
+        m_ngsHandler = nullptr;
+        NOTICE_LOG(m_logger) << "Could not init ngs - stopping application";
+        QCoreApplication::quit();
+        return;
+      }
+    }
+    connect(m_ngsHandler.get(), &NgsHandler::externalEquipmentNumberAdded,
+            m_wsHandler.get(), &WebSocketHandler::onExternalEquipmentNumberAdded, Qt::UniqueConnection);
+    connect(m_ngsHandler.get(), &NgsHandler::externalEquipmentNumberRemoved,
+            m_wsHandler.get(), &WebSocketHandler::onExternalEquipmentNumberRemoved, Qt::UniqueConnection);
+
+
+    connect(m_wsHandler.get(), &WebSocketHandler::initRequest,
+            m_ngsHandler.get(), &NgsHandler::participantInitRequest, Qt::UniqueConnection);
+    connect(m_wsHandler.get(), &WebSocketHandler::biteRequest,
+            m_ngsHandler.get(), &NgsHandler::participantBiteRequest, Qt::UniqueConnection);
+    NOTICE_LOG(m_logger) << "onExerciseHlaStateChanged - created new ngsHandler";
+    connect(m_ngsHandler.get(), &NgsHandler::firstTickFinished, this, [this](){m_wsHandler->sendHlaConnectionState();});
+  }
+  else
+  {
+    if (m_ngsHandler)
+      NOTICE_LOG(m_logger) << "onExerciseHlaStateChanged - deleting ngsHandler";
+    m_ngsHandler = nullptr;
+
+    if (m_wsHandler)
+    {
+      m_wsHandler->sendHlaConnectionState();
+      auto copy = m_wsHandler;
+      QTimer::singleShot(2000, this, [copy]
+      {
+        copy->deleteLater();
+      });
+    }
+    m_wsHandler = nullptr;
+  }
+}
+
+} // namespace HighLevelArchitecture