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/DotMatrixDisplay/displayPanelSimulatorTcpServer.h

@@ -0,0 +1,67 @@
+/**
+  * @RDE_HEADER@
+  * Display Panel Simulator TCP Server; observes the given port and emits the incoming messages
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Florian Schult, SLSE, 2016-03-18
+  */
+#pragma once
+
+//===Include specifications==================================================
+#include <QtCore/QObject>
+#include <NGLLogger/INGLLogger.h>
+
+#include "customMapsAndEnum.h"
+
+//===Forward declarations====================================================
+class QLabel;
+class QTcpServer;
+class QTcpSocket;
+class QLedLine;
+
+//===Class specifications====================================================
+/**
+ * Display panel simulator TCP server.
+ */
+class DisplayPanelSimulatorTcpServer: public QObject
+{
+  Q_OBJECT
+
+  // References -------------------------------------------------------------
+private:
+  /**
+   * Reference of the display panel simulator TCP server.
+   */
+  QTcpServer *mp_server;
+
+  /**
+   * Reference of the display panel simulator TCP socket.
+   */
+  QTcpSocket *mp_socket;
+
+  int              m_port;
+  NGL::INGLLogger &m_logger;
+
+  // Slots ------------------------------------------------------------------
+private Q_SLOTS:
+  void handleServerNewConnection();
+  void handleSocketReadyRead();
+
+  // Signals ----------------------------------------------------------------
+Q_SIGNALS:
+  void debugMessage(int port, const QString &message, MsgLvl lvl);
+  void plainMessage(const QString &message);
+
+  // Methods ----------------------------------------------------------------
+private:
+  void evaluateData(const QByteArray &data);
+  static char calculateChecksum(const QByteArray &data);
+
+public:
+  explicit DisplayPanelSimulatorTcpServer(QObject *parent = nullptr);
+  virtual ~DisplayPanelSimulatorTcpServer();
+  void start(int port);
+};
+
+//===========================================================================