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/ExerciseEventManagement/dds_handler.cpp

@@ -0,0 +1,74 @@
+/**
+  * DdsHandler for DDS
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Hanna E. Rathje, SLSE, 2015-09-02
+  */
+
+#include "dds_handler.h"
+
+#include <QTimer>
+
+namespace ExerciseEventManagement
+{
+
+DdsHandler::DdsHandler(int domainId, int partitionId, IDL::PartitionType partitionType)
+  : m_ddsConnector(std::make_shared<DDSConnector::DdsConnector>(domainId, partitionType, partitionId))
+  , m_logger(getLogger("DdsHandler"))
+{
+  DEBUG_LOG(m_logger) << "DdsHandler(" << domainId << ") for partition: " << m_ddsConnector->getDefaultPartition();
+}
+
+DdsHandler::~DdsHandler()
+{
+}
+
+bool DdsHandler::init(const QStringList &qosFileList)
+{
+  TRACE_LOG(m_logger) << " START, this=" << this;
+
+  if (!m_ddsConnector->init(qosFileList))
+  {
+    ERROR_LOG(m_logger) << "Error initializing dds connections - aborting";
+    return false;
+  }
+
+  // default initialize Publisher and Subscriber
+  m_ddsConnector->initPublisherSubscriber();
+  
+  // has to be false, because Snapshot Data Topics can be very large and fragmentation is not supported for batched writers!
+  m_ddsConnector->enableBatchedWriter(false);
+
+  // Pacemaker
+  m_pacemaker = new Core::Pacemaker(m_ddsConnector);
+
+  m_ddsDts = ExerciseEventManagement::Interface::Dts::create(m_ddsConnector);
+
+  bool bRet = m_ddsDts->enableAll();
+  INFO_LOG(m_logger) << "Dts initialised";
+
+  // Subsribe for InfrastructureManagement::MainStructureElement
+  m_dtcIsm = InfrastructureManagement::Interface::Dtc::create(m_ddsConnector);
+
+  TRACE_LOG(m_logger) << " END, this=" << this;
+  return bRet;
+}
+
+void DdsHandler::setRunningState(Core::RunningState rs)
+{
+  if (!m_pacemaker)
+    return;
+  m_pacemaker->setNewState(rs);
+}
+
+void DdsHandler::addPortToPacemaker(quint16 port, Core::PortType type)
+{
+  if (!m_pacemaker)
+    return;
+  m_pacemaker->addPort(port, type);
+}
+
+
+
+} // Namespace ExerciseEventManagement