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/tests/window.cpp

@@ -0,0 +1,59 @@
+#include "window.h"
+
+#include <LtsWidgets/lts_notification_box.h>
+
+#include <QApplication>
+#include <QHBoxLayout>
+
+
+namespace LtsWidgets
+{
+Window::Window(QWidget *parent)
+  : QWidget(parent)
+{
+  //Q_INIT_RESOURCE(lts_resources);
+
+  setGeometry(x(), y(), 300, 300);
+
+  QHBoxLayout *lay = new QHBoxLayout;
+
+  lay->setMargin(0);
+  //lay->setSizeConstraint(QLayout::SetMinimumSize);
+
+
+  auto x1 = new LtsWidgets::LtsNotificationBox;
+  lay->addWidget(x1);
+
+
+  if (qApp->arguments().count() < 2)
+    abort();
+
+
+  LtsNotificationBox::MessageType type;
+
+  if (qApp->arguments().at(1) == QStringLiteral("e"))
+    type = LtsNotificationBox::MessageType::Error;
+  else if (qApp->arguments().at(1) == QStringLiteral("w"))
+    type = LtsNotificationBox::MessageType::Warning;
+  else if (qApp->arguments().at(1) == QStringLiteral("i"))
+    type = LtsNotificationBox::MessageType::Info;
+  else if (qApp->arguments().at(1) == QStringLiteral("s"))
+    type = LtsNotificationBox::MessageType::Success;
+  else
+    abort();
+
+  x1->message(QStringLiteral("Title Message"), QStringLiteral("A text that consists of a lot of characters and also even has<br />two lines."), type);
+  connect(x1, &LtsNotificationBox::signalClose, this, &QWidget::close);
+
+  setLayout(lay);
+
+  setAttribute(Qt::WA_TranslucentBackground);
+}
+
+
+Window::~Window()
+{
+  //Q_CLEANUP_RESOURCE(lts_resources);
+}
+
+} // namespace LtsWidgets