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/DDS/DDSConnector/subscriber.cpp

@@ -0,0 +1,82 @@
+/**
+  * @RDE_HEADER@
+  *
+  * Subscriber (DDSConnector)
+  * Uses DTCs/DDTCs to subscribe to data
+  *
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include "subscriber.h"
+#include "pub_sub_base_p.h"
+
+#include <DDS/QosProfile/DDS_DefaultQos.h>
+#include <NGLLogger/INGLLogger.h>
+
+namespace DDSConnector
+{
+Subscriber::Subscriber(const dds::domain::DomainParticipant &domainParticipant, const std::string &partition, bool bUseSubscriberListener)
+  : PubSubBase(domainParticipant, partition, "DDSConnector.Subscriber")
+  , m_ddsSubscriber(nullptr)
+  , m_subscriberListener(bUseSubscriberListener ? new DDSGeneric::SubscriberListener : nullptr)
+  , m_subscriberListenerBinder(nullptr)
+{
+  Q_ASSERT(domainParticipant != nullptr);
+  initDDS();
+}
+
+Subscriber::~Subscriber()
+{
+  try
+  {
+    deleteDDS();
+  } catch (...)
+  {}
+}
+
+void Subscriber::initDDS()
+{
+  if (m_partitions.empty())
+    return;
+
+  // some debug output
+  if (m_logger.isDebugEnabled()) {
+    DEBUG_LOG(m_logger) << "Subscriber (DataReader) Qos: ";
+    dds::core::QosProvider qosProvider = dds::core::QosProvider::Default();
+    DDS::QosProfile::print(qosProvider.datareader_qos(), m_logger);
+  }
+
+  dds::sub::qos::SubscriberQos subscriberQos = m_domainParticipant.default_subscriber_qos();
+
+  // set a name for rtiadminconsole
+  rti::core::policy::EntityName entityName;
+  entityName.name(std::string("Sub ") + m_partitions.front());
+  subscriberQos << entityName;
+
+  DEBUG_LOG(m_logger) << "Subscribe on partition " << m_partitions.front();
+
+  m_ddsSubscriber = dds::sub::Subscriber(m_domainParticipant,
+                                         subscriberQos);
+
+  if (m_subscriberListener)
+    m_subscriberListenerBinder = rti::core::bind_and_manage_listener(m_ddsSubscriber,
+                                                                     m_subscriberListener,
+                                                                     DDSGeneric::SubscriberListener::mask());
+
+  updatePartitionQoS(m_ddsSubscriber);
+}
+
+void Subscriber::deleteDDS()
+{
+  if (m_subscriberListener)
+  {
+    m_subscriberListener->prepareShutdown();
+    m_subscriberListener = nullptr; // will be deleted due to bind_listener
+  }
+  m_subscriberListenerBinder = nullptr;
+  m_ddsSubscriber = nullptr;
+}
+
+} // Namespace DDSConnector