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/DDS/Generic/generic_base.h

@@ -0,0 +1,78 @@
+/**
+  * @RDE_HEADER@
+  * GenericBase (used as Base for all Generic<Items>)
+  *
+  * Items can be:
+  * - DataReaderObject        (DRO)
+  * - DataWriterObject        (DWO)
+  * - DynamicDataReaderObject (DDRO)
+  * - DataTopicClient         (DTC)
+  * - DataTopicServer         (DTS)
+  *
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+#include <dds/core/xtypes/DynamicData.hpp>
+#include <dds/core/xtypes/DynamicType.hpp>
+#include <dds/topic/Topic.hpp>
+
+#include <string>
+#include <DDS/Generic/ddsgen_export.h>
+
+class QObject;
+class QMetaMethod;
+
+namespace NGL {
+class INGLLogger;
+}
+
+namespace DDS
+{
+
+template<typename T>
+struct topic_type_name {
+    static std::string value() {
+        return dds::topic::topic_type_name<T>::value();
+    }
+};
+template<>
+struct topic_type_name<dds::core::xtypes::DynamicData> {
+    static std::string value() {
+        return "dds::topic::DynamicData::value()";
+    }
+};
+template<>
+struct topic_type_name<rti::core::xtypes::DynamicTypeImpl> {
+    static std::string value() {
+      return "dds::topic::DynamicTypeImpl::value()";
+    }
+};
+
+
+namespace Helper
+{
+DDSGEN_EXPORT  std::string getFunctionTopicName(const std::string &fqName);
+DDSGEN_EXPORT  std::string getShortTopicName(const std::string &fqName);
+
+/**
+   * @brief
+   * getMethod checks if the given object has a slot with the given name (slotToExecute)
+   * and if the signature is correct.
+   *
+   * @param objectToInform
+   * @param slotToExecute
+   * @param signalSignature
+   * @return QMetaMethod
+   */
+DDSGEN_EXPORT  QMetaMethod getMethod(NGL::INGLLogger &logger,
+                                     QObject *objectToInform,
+                                     const char *slotToExecute,
+                                     const char *signalSignature,
+                                     bool bWarnOnEmptySlot = true);
+}
+
+}