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/Proxies/HighLevelArchitecture/Common/identifierstruct.cpp

@@ -0,0 +1,89 @@
+/**
+  * Helper Class for handling Entity IdentifierStructs
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Malte Diers, NLE, 2019-07-11
+  */
+
+#include "identifierstruct.h"
+#include "settings.h"
+#include <EntityIdentifierStruct.h>
+
+namespace HighLevelArchitecture
+{
+
+quint16 IdentifierStruct::s_nextId = 1;
+quint16 IdentifierStruct::s_ownSiteId = 1;
+
+IdentifierStruct::IdentifierStruct(const rpr2::EntityIdentifierStruct &eis)
+  : m_siteId(eis.FederateIdentifier.SiteID)
+{
+  setSiteId(eis.FederateIdentifier.SiteID);
+  setApplicationId(eis.FederateIdentifier.ApplicationID);
+  setEntityNumber(eis.EntityNumber);
+}
+
+rpr2::EntityIdentifierStruct IdentifierStruct::toEIS() const
+{
+  rpr2::EntityIdentifierStruct eis;
+  eis.FederateIdentifier.SiteID        = siteId();
+  eis.FederateIdentifier.ApplicationID = applicationId();
+  eis.EntityNumber                     = entityNumber();
+  return eis;
+}
+
+void IdentifierStruct::makeOwn()
+{
+  setSiteId(ownSiteId());
+  setApplicationId(ownApplicationId());
+}
+
+QString IdentifierStruct::toString() const
+{
+  return QStringLiteral("[Site %1 | Application: %2 | Entity %3]")
+      .arg(siteId())
+      .arg(applicationId())
+      .arg(entityNumber());
+}
+
+qint64 IdentifierStruct::toInt64() const
+{
+  quint64 res = 0;
+  res += siteId();
+  res <<= 16;
+  res += applicationId();
+  res <<= 16;
+  res += entityNumber();
+  return static_cast<qint64>(res);
+}
+
+IdentifierStruct IdentifierStruct::fromInt64(qint64 value)
+{
+  const quint64 uvalue = static_cast<quint64>(value);
+  IdentifierStruct is;
+  if ((uvalue >> 32) == 0)
+    is.setSiteId(ownSiteId());
+  else
+    is.setSiteId((uvalue >> 32) & 0xffffU);
+
+  if (((uvalue >> 16) & 0xffffU) == 0)
+    is.setApplicationId(ownApplicationId());
+  else
+    is.setApplicationId((uvalue >> 16 & 0xffffU));
+
+  is.setEntityNumber(uvalue & 0xffffU);
+  return is;
+}
+
+quint16 IdentifierStruct::ownSiteId()
+{
+  return s_ownSiteId;
+}
+
+quint16 IdentifierStruct::ownApplicationId()
+{
+  static const int s_applicationId = Settings::applicationId();
+  return s_applicationId;
+}
+} // namespace