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/Common/CodeGen/GeneratorGrantleeBase.h

@@ -0,0 +1,58 @@
+/**
+  * @RDE_HEADER@
+  * Generate enum access functions (static enums, values from xml-file)
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+#pragma once
+
+#include "codegen_export.h"
+#include "XmlReader.h"
+#include <QObject>
+#include <QSharedPointer>
+
+namespace NGL
+{
+class INGLLogger;
+}
+
+namespace Grantlee
+{
+class Context;
+class Engine;
+class TemplateImpl;
+using Template = QSharedPointer<TemplateImpl>;
+}
+namespace CodeGen
+{
+class StructBuilder;
+
+class GeneratorGrantleeBase : public QObject
+{
+  Q_OBJECT
+public:
+  virtual ~GeneratorGrantleeBase();
+  virtual bool init(const XmlReader *reader, StructBuilder *structBuilder) = 0;
+  bool setTemplate(const QString &templateName, const QString &tmpl);
+  QString render() const;
+  QString errorString() const;
+  bool generateData(const QString &templateName,
+                    const QString &outDirectory);
+
+protected:
+  explicit GeneratorGrantleeBase(const char *loggerName);
+
+  bool initInternal(const XmlReader *reader, StructBuilder *structBuilder);
+  bool readFile(const QString &filename, QString &data) const;
+  bool getFilenameFromData(const QString &dataToParse, QString &filename) const;
+  void addCustomFunctions(const QVector<CustomServiceFunctionInformation> &customFunctions);
+  void exportUsedServices(const XmlReader *reader);
+protected:
+  Grantlee::Engine *m_engine;
+  Grantlee::Context *m_ctx;
+  Grantlee::Template m_template;
+  StructBuilder *m_structBuilder;
+  NGL::INGLLogger &m_logger;
+};
+} // namespace CodeGen