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/WirelessLocationSystem/main_handler.cpp

@@ -0,0 +1,65 @@
+/**
+  * MainHandler for TetraRadio
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-04-14
+  */
+
+#include "main_handler.h"
+#include "settings.h"
+#include <DDS/Core/pacemaker.h>
+
+namespace WirelessLocationSystem
+{
+
+MainHandler::MainHandler(QObject *parent)
+  : QObject(parent)
+  , m_ddsHandler(nullptr)
+  , m_logger(getLogger("MainHandler"))
+{}
+
+MainHandler::~MainHandler()
+{
+  m_wlsParticipantHandler = nullptr;
+  m_wlsHandler = nullptr;
+  m_wsHandler = nullptr;
+  m_ismHandler = nullptr;
+  m_ddsHandler = nullptr;
+}
+
+bool MainHandler::init(int domainId)
+{
+  const int exerciseId = 0;
+  // initialize DDS
+  m_ddsHandler = std::make_shared<DdsHandler>(domainId, exerciseId);
+  if (!m_ddsHandler->init())
+    return false;
+
+  m_wlsParticipantHandler = std::make_shared<WlsParticipantHandler>();
+  m_wsHandler = std::make_shared<WebSocketHandler>();
+  m_ismHandler = std::make_shared<IsmHandler>();
+  m_wlsHandler = std::make_shared<WlsHandler>();
+
+  if (!m_ismHandler->init(this))
+    return false;
+
+  if (!m_wlsHandler->init(m_wlsParticipantHandler.get(), // TODO: if using shared pointers, then *use* them
+                          m_wsHandler.get(),
+                          Settings::wlsListenPort()))
+    return false;
+
+  if (!m_wsHandler->init(m_wlsHandler,
+                         m_wlsParticipantHandler,
+                         m_ismHandler,
+                         Settings::webSocketListenPort()))
+    return false;
+  m_wlsParticipantHandler->init(m_wsHandler.get(), // TODO: if using shared pointers, then *use* them
+                                m_wlsHandler.get());
+
+  m_ddsHandler->pacemaker()->setNewState(Core::RunningState::Running);
+
+  return true;
+}
+
+} // namespace WirelessLocationSystem