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/DatabaseGeneratorGrantlee.cpp

@@ -0,0 +1,64 @@
+/**
+  * @RDE_HEADER@
+  * Generate cpp structs from xml
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#include "DatabaseGeneratorGrantlee.h"
+#include "StructBuilder.h"
+#include <NGLLogger/INGLLogger.h>
+#include <grantlee/context.h>
+
+using namespace CodeGen;
+
+DatabaseGeneratorGrantlee::DatabaseGeneratorGrantlee(bool targetIsServer)
+  : GeneratorGrantleeBase("CodeGen.CppStructGeneratorGrantlee")
+  , m_targetIsServer(targetIsServer)
+{}
+
+bool DatabaseGeneratorGrantlee::init(const XmlReader *reader,
+                                      StructBuilder *structBuilder)
+{
+  if (!GeneratorGrantleeBase::initInternal(reader, structBuilder))
+    return false;
+
+  // Is Service exercise-independent?
+  if (reader->isServiceExerciseIndependent())
+    m_ctx->insert(QStringLiteral("isExerciseIndependent"), QLatin1String("1"));
+
+  bool bHasDbNotifications = false;
+  QVector<DbStructWrapper *> vlServiceStructs;
+  QVector<DbStructWrapper *> vlStaticDataStructs;
+  const QVector<CompleteStructInformation> csiData = structBuilder->structInformations();
+  vlServiceStructs.reserve(csiData.size());
+  vlStaticDataStructs.reserve(csiData.size());
+  for (const CompleteStructInformation &csi : csiData)
+  {
+    DbStructWrapper *dbStructWrapper(new DbStructWrapper(csi, this));
+
+    if (csi.hasStaticContent)
+      vlStaticDataStructs += dbStructWrapper;
+    else
+      vlServiceStructs += dbStructWrapper;
+    if (!csi.dbNotifications.isEmpty())
+      bHasDbNotifications = true;
+  }
+  addCustomFunctions(reader->getCustomFunctions());
+
+  if (structBuilder->needPoint3d())
+    m_ctx->insert(QStringLiteral("need_point3d"), QLatin1String("1"));
+  if (structBuilder->needPgArrayInclude())
+    m_ctx->insert(QStringLiteral("need_pgarray"), QLatin1String("1"));
+  m_ctx->insert(QStringLiteral("cpp_structs"), QVariant::fromValue(vlServiceStructs));
+  m_ctx->insert(QStringLiteral("data_structs"), QVariant::fromValue(vlStaticDataStructs));
+  if (bHasDbNotifications)
+    m_ctx->insert(QStringLiteral("has_db_notifications"), QLatin1String("1"));
+
+  m_ctx->insert(QStringLiteral("library_target"), m_targetIsServer ? QStringLiteral("SERVER") : QStringLiteral("COMMON"));
+
+  exportUsedServices(reader);
+
+  return true;
+}