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/Map/layer_parameter.h

@@ -0,0 +1,85 @@
+/**
+  * @RDE_HEADER@
+  * Class LayerParameter
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+// Own
+#include "situation_map_types.h"
+#include <Common/situation_map_logging.h>
+#include <situation_map_export.h>
+
+// Qt
+#include <QString>
+#include <QUrl>
+
+class QJsonObject;
+
+//----------------------------------------------------------------------------
+namespace SituationMap
+{
+
+//----------------------------------------------------------------------------
+/**
+ * @brief The LayerParameter struct contains parameter of a layer
+ * like visibility, opacity, brightness ....
+ */
+class SITUATIONMAP_EXPORT LayerParameter
+{
+public:
+  static const uint UNDEFINED_SCALE = 0;  // neg. value are not defined/allowed (will be ignored by Esri -> errorprone)
+
+public:
+  LayerParameter();
+  ~LayerParameter() = default;
+
+  void resetView();
+
+  bool minScaleValid() const        { return (minScale >= 0); }
+  bool maxScaleValid() const        { return (maxScale >= 0); }
+  bool minMaxScaleValid() const     { return minScaleValid() && maxScaleValid(); }
+
+  bool operator==(const LayerParameter &other) const;
+  bool operator!=(const LayerParameter &other) const;
+
+  static LayerParameter read(const QJsonObject &json);
+  QJsonObject toJsonObject() const;
+
+  QString toString() const;
+
+
+  bool      visible          = true;
+  int       opacity          = 100;   ///< value range: 0..100; 100 everything is visible
+  int       brightness       = 0;     ///< value range: -100 .. 100
+  int       contrast         = 0;     ///< value range: -100 .. 100
+  int       gamma            = 0;     ///< value range: -100 .. 100
+
+  // Context Basemaplayer: value of -1 is the indicator, that the layer is NOT loaded yet:
+  double    minScale         = -1;     ///< big value   (e.g. 10000000) limiting zoomOut  1:10000000 -> 0.0000001 ; '0' without function
+  double    maxScale         = -1;     ///< small value (e.g. 1000)     limiting zoomIn   1:1000     -> 0.001     ; '0' without function
+
+
+  BasemapType basemapType = BasemapType::Undefined;
+
+  QString   displayName;
+  QString   description;
+  QImage    previewImage;
+
+
+
+  // following member won`t be 'set/written' to EsriLayer:
+  QUrl      url;
+  QString   svcDescription;
+};
+//----------------------------------------------------------------------------
+
+SITUATIONMAP_EXPORT std::ostream  &operator<< (std::ostream &stream,
+                                               const LayerParameter &value);
+
+} // namespace SituationMap
+
+Q_DECLARE_METATYPE(SituationMap::LayerParameter)