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/Tools/QLedLine/Test/fullline.cpp

@@ -0,0 +1,39 @@
+#include <QLayout>
+
+#include "fullline.h"
+#include "ui_fullline.h"
+
+FullLine::FullLine(int lineIndex, int height, int charcount, QWidget *parent) :
+  QWidget(parent)
+  , m_ui(new Ui::FullLine)
+{
+  m_ui->setupUi(this);
+
+  m_ui->props->setLineIndex(lineIndex);
+  m_ui->ledLine->setCharCountAndHeight(charcount, height);
+
+  connect(m_ui->props, &Props::flashTimeChanged, m_ui->ledLine, &QLedLine::setFlashing);
+  connect(m_ui->props, &Props::colorChanged,     m_ui->ledLine, &QLedLine::setColor);
+  connect(m_ui->props, &Props::textChanged,      m_ui->ledLine, &QLedLine::setText);
+  connect(m_ui->props, &Props::showText,         m_ui->ledLine, &QLedLine::setTextVisible);
+}
+
+FullLine::~FullLine()
+{
+  delete m_ui;
+}
+
+void FullLine::setCharCount(int count)
+{
+  m_ui->ledLine->setCharCount(count);
+}
+
+int FullLine::charCount() const
+{
+  return m_ui->ledLine->charCount();
+}
+
+void FullLine::setHeight(int height)
+{
+  m_ui->ledLine->setHeight(height);
+}