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/content.cpp

@@ -0,0 +1,92 @@
+#include <QLayout>
+
+#include "content.h"
+#include "fullline.h"
+#include "ui_content.h"
+
+Content::Content(QWidget *parent) : QWidget(parent)
+  , m_ui(new Ui::Content)
+{
+  m_ui->setupUi(this);
+}
+
+Content::~Content()
+{
+  delete m_ui;
+}
+
+void Content::init()
+{
+  delete layout();
+  m_layout = new QVBoxLayout(this);
+  m_layout->setSpacing(0);
+
+  while (!m_lines.isEmpty())
+    deleteLastLine();
+
+  while (m_lines.size() < m_lineCount)
+    newLine();
+}
+
+void Content::setLineCount(int lineCount)
+{
+  while(lineCount != m_lines.size())
+  {
+    if(lineCount > m_lineCount)
+      newLine();
+    else if (lineCount < m_lineCount)
+      deleteLastLine();
+  }
+
+  m_lineCount = m_lines.size();
+}
+
+void Content::setCharCount(int charCount)
+{
+  m_charCount = charCount;
+
+  for (FullLine * l : qAsConst(m_lines))
+    l->setCharCount(m_charCount);
+}
+
+int Content::charCount() const
+{
+  return m_charCount;
+}
+
+void Content::setHeight(int height)
+{
+  m_height = height;
+
+  for (FullLine * l : qAsConst(m_lines))
+    l->setHeight(height);
+}
+
+int Content::height() const
+{
+  return m_height;
+}
+
+void Content::setCharCountAndHeight(int charCount, int height)
+{
+  m_charCount = charCount;
+  m_height = height;
+
+  init();
+}
+
+void Content::newLine()
+{
+  FullLine *line = new FullLine(m_lines.count()+1, m_height, m_charCount, this);
+  m_layout->addWidget(line);
+  m_lines.append(line);
+}
+
+void Content::deleteLastLine()
+{
+  if (m_lines.isEmpty())
+    return;
+
+  delete m_lines.last();
+  m_lines.remove(m_lines.size()-1);
+}