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/SerialToTcpConverter/controller.cpp

@@ -0,0 +1,93 @@
+/**
+  * Controller for managing converter threads
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Philipp Dassow, NLT, 30-11-2018
+  */
+#include "controller.h"
+#include "settings.h"
+
+#include <QSystemTrayIcon>
+#include <QMenu>
+
+namespace SerialToTcpConverter
+{
+
+Controller::Controller(QObject *parent)
+ : QObject(parent)
+ , m_converterData()
+ , m_icon(new QSystemTrayIcon(this))
+ , m_logger(getLogger("Controller"))
+{
+  m_icon->setIcon(QIcon(QLatin1String(":/style/messages.svg")));
+  m_icon->show();
+}
+
+Controller::~Controller()
+{
+  for (const ConverterData &data : qAsConst(m_converterData))
+  {
+    if (!data.thread)
+      continue;
+    data.thread->disconnect(this);
+    data.thread->quit();
+  }
+  for (const ConverterData &data : qAsConst(m_converterData))
+  {
+    if (!data.thread)
+      continue;
+    data.thread->wait();
+  }
+}
+
+bool Controller::init()
+{
+  QMenu *menu = new QMenu;
+  const auto configs = Settings::configs();
+  for (const Settings::Config &config : configs)
+  {
+    INFO_LOG(m_logger) << "Creating converter-thread for " << config.serialPortName;
+
+    ConverterData data;
+    data.serialPortName = config.serialPortName;
+    ConverterThread *converterThread = new ConverterThread(config.serialPortName, config.serialBaudrate, config.tcpPort);
+    data.thread = converterThread;
+    QAction *action = new QAction(QIcon(QLatin1String(":/style/pu_yellow.svg")), tr("%1 <-> %2").arg(config.serialPortName, QString::number(config.tcpPort)), menu);
+    data.menuAction = action;
+    menu->addAction(action);
+
+    m_converterData.insert(data.serialPortName, data);
+    connect(converterThread, &ConverterThread::finished, this, &Controller::onThreadExit);
+    connect(converterThread, &ConverterThread::connected, this, &Controller::onThreadConnected);
+    converterThread->start();
+  }
+  m_icon->setContextMenu(menu);
+
+  return true;
+}
+
+void Controller::onThreadExit()
+{
+  ConverterThread *t = qobject_cast<ConverterThread*>(sender());
+  if (!t)
+    return;
+
+  const QString name = t->portName();
+  auto &data = m_converterData[name];
+
+  INFO_LOG (m_logger) << "Exiting converter-thread for serial port: "<< data.serialPortName;
+
+  data.menuAction->setIcon(QIcon(QLatin1String(":/style/pu_red.svg")));
+  data.thread->deleteLater();
+  data.thread = nullptr;
+}
+
+void Controller::onThreadConnected(const QString &portName)
+{
+  if (!m_converterData.contains(portName))
+    return;
+  m_converterData[portName].menuAction->setIcon(QIcon(QLatin1String(":/style/pu_green.svg")));
+}
+
+} //namespace SerialToTcpConverter