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/LtsTimelineClassic/TestTimelineModel.cpp

@@ -0,0 +1,46 @@
+/**
+  * @RDE_HEADER@
+  * test-case model to test timeline
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Mike Wille, SLSE, 2015-09-23
+  */
+
+
+#include "TestTimelineModel.h"
+
+#include "EventGraphic.h"
+
+#include <QToolTip>
+#include <QDebug>
+
+
+namespace LtsTimelineClassic
+{
+
+TestTimelineModel::TestTimelineModel()
+  : AbstractTimelineModel()
+{
+
+}
+
+void TestTimelineModel::addTestEvent(Event *event)
+{
+  AbstractTimelineModel::addEvent(event);
+}
+
+void TestTimelineModel::slotEventAction(EventGraphic *eg, int actionType) // for clicking an event
+{
+  (void)actionType;
+
+  QString content = tr("Event count: %1").arg(QString::number(eg->eventList().count()));
+
+  for (int i = 0; i < eg->eventList().count(); i++)
+  {
+    content += QLatin1String("\r\nTime: ");
+    content += QString::number(eg->eventList().at(i)->startTime());
+  }
+}
+
+}