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/LtsWidgets/lts_events.cpp

@@ -0,0 +1,63 @@
+/**
+* @RDE_HEADER@
+* Events provided by LtsWidgets
+* $Id$
+* $HeadURL$
+* $Author$
+*/
+
+#include "lts_events.h"
+
+namespace LtsWidgets
+{
+QEvent::Type LtsLinkEvent::eventTypeId()
+{
+  static QEvent::Type sLinkEventId = QEvent::None;
+  if (sLinkEventId == QEvent::None)
+    sLinkEventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return sLinkEventId;
+}
+
+QEvent::Type SaveImageEvent::saveImageEventId()
+{
+  static QEvent::Type sSaveImageEventId = QEvent::None;
+  if (sSaveImageEventId == QEvent::None)
+    sSaveImageEventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return sSaveImageEventId;
+}
+
+QEvent::Type SetMarkerEvent::setMarkerEventId()
+{
+  static QEvent::Type sSetMarkerEventId = QEvent::None;
+  if (sSetMarkerEventId == QEvent::None)
+    sSetMarkerEventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return sSetMarkerEventId;
+}
+
+QEvent::Type AddMarkerEvent::addMarkerEventId()
+{
+  static QEvent::Type sAddMarkerEventId = QEvent::None;
+  if (sAddMarkerEventId == QEvent::None)
+    sAddMarkerEventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return sAddMarkerEventId;
+}
+
+QEvent::Type AddSnapshotEvent::addSnapshotEventId()
+{
+  static QEvent::Type eventId = QEvent::None;
+  if (eventId == QEvent::None)
+    eventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return eventId;
+}
+
+QEvent::Type SaveSnapshotEvent::saveSnapshotEventId()
+{
+  static QEvent::Type eventId = QEvent::None;
+  if (eventId == QEvent::None)
+    eventId = static_cast<QEvent::Type>(QEvent::registerEventType());
+  return eventId;
+}
+
+
+
+} // namespace LtsWidgets