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/Tools/DdsView/subscriber.cpp

@@ -0,0 +1,79 @@
+/**
+  * @RDE_HEADER@
+  *
+  * Subscriber (DataSampleReceiver)
+  * Uses DDTCs to subscribe to data
+  *
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+#include "subscriber.h"
+#include "telegrammodel.h"
+
+namespace DdsView
+{
+
+Subscriber::Subscriber(const dds::domain::DomainParticipant &domainParticipant,
+                       const std::string &partition,
+                       TelegramModel *tm)
+  : DDSConnector::Subscriber(domainParticipant, partition)
+  , m_telegramModel(tm)
+  , m_logger(DdsView::getLogger("Subscriber"))
+{}
+
+Subscriber::~Subscriber()
+{
+  qDeleteAll(m_ddtcMap);
+  m_ddtcMap.clear();
+}
+
+void Subscriber::processData(const dds::core::xtypes::DynamicData &data, const QString &topicName, DataModification modType)
+{
+  m_telegramModel->processData(data, topicName, modType);
+}
+
+bool Subscriber::initDDTCs(const QVector<DDSGeneric::TopicDescription> &vDro)
+{
+  // TODO: remove old droEntries
+
+  QMap<std::string, ddtc *> newTopics;
+
+  for (const DDSGeneric::TopicDescription &ti : vDro)
+  {
+    auto it = m_ddtcMap.find(ti.name);
+    if (it != m_ddtcMap.end())
+    {
+      // already there
+      newTopics.insert(it.key(), it.value());
+      m_ddtcMap.erase(it);
+      continue;
+    }
+
+    DTC::Ddtc<DDSGeneric::DynamicDataReader> *ddtc = this->create(
+                                                       [this](const dds::core::xtypes::DynamicData & data, const std::string & topicName, DataModification modType)
+    { processData(data, QString::fromStdString(topicName), modType); },
+    ti.type,
+    nullptr /* Use SubscriberListener from DdsConnector */,
+    ti.name
+                                                     );
+    if (ddtc == nullptr)
+    {
+      ERROR_LOG(m_logger) << "Can't create ddtc for Topic (" << ti.name << "), TypeName (" << ti.typeName << ")";
+      continue;
+    }
+
+    if (ddtc->hasSamples())
+    {
+      for (const auto &data : ddtc->readAlive())
+        processData(data.data(), QString::fromStdString(ti.name), DataModification::eAdded);
+    }
+    newTopics.insert(ti.name, ddtc);
+  }
+  qDeleteAll(m_ddtcMap);
+  m_ddtcMap = newTopics;
+
+  return true;
+} // end initDDTCs()
+
+} // Namespace DdsView