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/CnrProxyTester/message_model.h

@@ -0,0 +1,79 @@
+/**
+ * @RDE_HEADER@
+ * The MessageModel class handles message related data
+ * $Id$
+ * $HeadURL$
+ * $Author$
+ * Created by Hannes Fritsche, SLSE, 2017-09-06
+ */
+
+#pragma once
+
+#include <LtsWidgets/lts_abstract_table_model.h>
+#include <QDateTime>
+
+class QWebSocket;
+
+struct MessageInfo
+{
+  QDateTime time;
+  int32_t idVal;
+  QString direction;
+  QString type;
+  QString uuid;
+  QString data;
+
+  MessageInfo(int32_t id, const QString &direction, const QString &type, const QString &uuid, const QString &data)
+    : time(QDateTime::currentDateTime())
+    , idVal(id)
+    , direction(direction)
+    , type(type)
+    , uuid(uuid)
+    , data(data)
+  {}
+
+  MessageInfo()
+    : time(QDateTime::currentDateTime())
+    , idVal(-1)
+    , direction(QLatin1String("-"))
+    , type(QLatin1String("-"))
+    , uuid(QLatin1String("-"))
+    , data(QLatin1String("-"))
+  {}
+
+  int32_t id() const { return idVal; }
+};
+
+class MessageModel
+  : public LtsWidgets::LtsAbstractTableModel<MessageInfo>
+{
+  Q_OBJECT
+public:
+  enum MessageDirection
+  {
+    TO_PROXY,
+    FROM_PROXY
+  };
+
+  enum Column
+  {
+    TIME,
+    DIRECTION,
+    TYPE,
+    UUID,
+    DATA
+  };
+
+  MessageModel(QObject *parent = nullptr);
+
+  void addMessage(MessageDirection direction, const QString &message);
+  void addMessage(MessageDirection direction, const QString &type, const QString &uuid, const QString &data);
+
+  QVariant data(const QModelIndex &index, int role) const override final;
+
+private: // methods
+  QString toString(MessageDirection direction) const;
+
+public:
+};
+