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>

qt6-after/qt6-migrated-legatus/Lts/Proxies/Buildings/main_handler.cpp

@@ -1,16 +1,23 @@
-
-
+/**
+  * MainHandler for Buildings
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-04-14
+  */
 
 #include "main_handler.h"
 #include "settings.h"
-#include <Core/pacemaker.h>
+#include <DDS/Core/pacemaker.h>
 #include <AssetManagement/asm_dtc.h>
-#include <QtCore/QObject>
+#include <QObject>
 
 namespace Buildings
 {
-MainHandler::MainHandler(QObject *parent) : QObject(parent),
-    m_logger(NGL::NGLLoggerBootstrap::getNGLRootLogger()) {}
+MainHandler::MainHandler(QObject *parent)
+  : QObject(parent)
+  , m_logger(getLogger("MainHandler"))
+{}
 
 MainHandler::~MainHandler()
 {
@@ -30,7 +37,7 @@ bool MainHandler::init(int domainId, int exerciseId)
 
 
   DEBUG_LOG(m_logger) << "WebSocketInterfaceHandler initialized Port=" << m_webSocketHandler->listenPort();
-  m_ddsHandler->pacemaker()->addPort(m_webSocketHandler->listenPort(), Core::CorePortType::WebSocketServer);
+  m_ddsHandler->pacemaker()->addPort(m_webSocketHandler->listenPort(), Core::PortType::WebSocketServer);
 
   if (bRet)
   {
@@ -59,7 +66,7 @@ bool MainHandler::initInternal(int domainId, int exerciseId)
   }
   INFO_LOG(m_logger) << "DbHandler initialized";
 
-  
+  // initialize DDS
   m_ddsHandler = std::make_shared<DdsHandler>(domainId, exerciseId);
   if (!m_ddsHandler->init())
     return false;
@@ -82,7 +89,7 @@ bool MainHandler::initInternal(int domainId, int exerciseId)
   if (!m_relayInfoHandler->init())
     return false;
 
-  
+  // WebSocketServer
   m_webSocketHandler = std::make_shared<WebSocketHandler>(m_bcHandler,this);
 
   if (!m_webSocketHandler->init(Settings::getWebSocketServerPortRange(1)))
@@ -122,4 +129,4 @@ std::shared_ptr<DatabaseInterface> MainHandler::db() const
 }
 
 
-} 
+} // namespace Buildings