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/participantinformation.cpp

@@ -0,0 +1,26 @@
+/**
+  * Helper Class for handling Participant Information
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Malte Diers, NLE, 2019-07-11
+  */
+
+#include "participantinformation.h"
+#include <ParticipantManagement/ppm.hpp>
+
+namespace HighLevelArchitecture {
+
+ParticipantInformation::ParticipantInformation(const ParticipantManagement::Participant &participant,
+                                               const TypeStruct &_typestruct,
+                                               const ParticipantPosition &_position)
+  : participantId(participant.id())
+  , equipmentNo(participant.equipmentNumber().is_set() ? participant.equipmentNumber().get() : 0)
+  , partyId(participant.partyId())
+  , parentId(participant.superiorId())
+  , typeStruct(_typestruct)
+  , designator(QString::fromStdString(participant.designator()))
+  , position(_position)
+{}
+
+} // Namespace HLA