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/Viewer/SituationMap/Symbology/symbol_properties.cpp

@@ -0,0 +1,156 @@
+/**
+  * @RDE_HEADER@
+  * SymbolProperties
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+// Own
+#include "symbol_properties.h"
+#include <SymbologyImpl/advanced_symbology_logging.h> // to get operator<< (std::ostream& stream, const QString& string_ref)
+
+
+// ESRI
+
+
+// Qt
+#include <QStringRef>
+
+
+namespace AdvancedSymbology
+{
+
+QString SymbolProperties::key() const
+{
+  return m_key;
+}
+
+void SymbolProperties::setKey(const QString &key)
+{
+  m_key = key;
+}
+
+QString SymbolProperties::name() const
+{
+  return m_name;
+}
+
+void SymbolProperties::setName(const QString &name)
+{
+  m_name = name;
+}
+
+QString SymbolProperties::category() const
+{
+  return m_category;
+}
+
+void SymbolProperties::setCategory(const QString &category)
+{
+  m_category = category;
+}
+
+QString SymbolProperties::symbolClass() const
+{
+  return m_symbolClass;
+}
+
+void SymbolProperties::setSymbolClass(const QString &symbolClass)
+{
+  m_symbolClass = symbolClass;
+}
+
+QStringList SymbolProperties::tags() const
+{
+  return m_tags;
+}
+
+QString SymbolProperties::gctString() const
+{
+  for (const QString &tag : m_tags)
+  {
+    if (tag.startsWith(QLatin1String("gct_")))
+      return tag;
+  } // foreach
+  return QString();
+}
+
+void SymbolProperties::setTags(const QStringList &tags)
+{
+  m_tags = tags;
+}
+
+GeometryType SymbolProperties::geometryType() const
+{
+  return m_geometryType;
+}
+
+void SymbolProperties::setGeometryType(const GeometryType &geometryType)
+{
+  m_geometryType = geometryType;
+}
+
+
+QString SymbolProperties::sidc() const
+{
+  return m_sidc;
+}
+
+
+void SymbolProperties::setSidc(const QString &sidc)
+{
+  m_sidc = sidc;
+}
+
+
+QString SymbolProperties::originalKey() const
+{
+  return m_originalKey;
+}
+
+void SymbolProperties::setOriginalKey(const QString &originalKey)
+{
+  m_originalKey = originalKey;
+}
+
+
+QString SymbolProperties::key_SymbolSet() const
+{
+  if (m_key.count() < 8)
+    return QString();
+  return QStringRef(&m_key, 0, 2).toString();
+}
+QString SymbolProperties::key_Entity() const
+{
+  if (m_key.count() < 8)
+    return QString();
+  return QStringRef(&m_key, 2, 6).toString();
+}
+
+QString SymbolProperties::key_SymbolSetEntity() const
+{
+  if (m_key.count() < 8)
+    return QString();
+
+  return key_SymbolSet() + key_Entity();
+}
+
+
+QColor SymbolProperties::colorToBeReplaced() const
+{
+  return m_colorToBeReplaced;
+}
+void SymbolProperties::setColorToBeReplaced(const QColor &colorToBeReplaced)
+{
+  m_colorToBeReplaced = colorToBeReplaced;
+}
+
+//-----------------------------------------------------------------------------
+
+
+
+
+} // namespace AdvancedSymbology
+
+