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/participantposition.cpp

@@ -0,0 +1,62 @@
+/**
+  * Helper Class for handling (Participant) Positions
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Malte Diers, NLE, 2019-07-11
+  */
+
+#include "participantposition.h"
+#include <LtsCoordTrans/lts_coord_trans.h>
+
+namespace HighLevelArchitecture
+{
+
+//
+// ParticipantPosition
+//
+rpr2::WorldLocationStruct ParticipantPosition::toWorldLocation() const
+{
+  rpr2::WorldLocationStruct wl;
+
+  LtsCoordTrans::lonLatAltToGeocentric(lon, lat, -z, wl.X, wl.Y, wl.Z);
+
+  return wl;
+}
+
+QString ParticipantPosition::toString(bool mgrs) const
+{
+  if (!mgrs)
+    return QStringLiteral("lon: %1, lat: %2, z: %3").arg(lon).arg(lat).arg(z);
+
+  const LtsCoordTrans::UtmCoordinate c1(LtsCoordTrans::UtmCoordinate::fromGeographic(lon, lat));
+  return QStringLiteral("MGRS: %1, Z: %2").arg(c1.mgrs()).arg(z);
+}
+
+bool ParticipantPosition::hasMoved(const ParticipantPosition &other) const
+{
+  const LtsCoordTrans::UtmCoordinate c1(LtsCoordTrans::UtmCoordinate::fromGeographic(lon, lat));
+  const LtsCoordTrans::UtmCoordinate c2(LtsCoordTrans::UtmCoordinate::fromGeographic(other.lon, other.lat));
+
+  if (c1.zone != c2.zone)
+    return true;
+  if (std::abs(c1.x - c2.x) > 1)
+    return true;
+  if (std::abs(c1.y - c2.y) > 1)
+    return true;
+  return false;
+}
+
+bool ParticipantPosition::isNull() const
+{
+  return (qFuzzyIsNull(lon) && qFuzzyIsNull(lat));
+}
+
+ParticipantPosition::ParticipantPosition(const rpr2::WorldLocationStruct &wl)
+{
+  LtsCoordTrans::geocentric2LonLatAlt(wl.X, wl.Y, wl.Z, lon, lat, z);
+  z *= -1;
+}
+
+} // Namespace
+