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/EvalApps/Viewshed3D/ViewshedLocation.h

@@ -0,0 +1,99 @@
+/**
+  * @RDE_HEADER@
+  * Declaration/Definition
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+// [WriteFile Name=ViewshedLocation, Category=Analysis]
+// [Legal]
+// Copyright 2017 Esri.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// [Legal]
+
+#ifndef VIEWSHEDLOCATION_H
+#define VIEWSHEDLOCATION_H
+
+#include <QObject>
+#include <QColor>
+
+
+namespace Esri
+{
+namespace ArcGISRuntime
+{
+class SceneGraphicsView;
+class LocationViewshed;
+class AnalysisOverlay;
+}
+}
+
+
+class ViewshedLocation : public QObject
+{
+  Q_OBJECT
+
+public:
+  explicit ViewshedLocation(QObject* parent = nullptr);
+  ~ViewshedLocation() = default;
+
+//  void componentComplete() Q_DECL_OVERRIDE;
+  void init(Esri::ArcGISRuntime::SceneGraphicsView* sceneView);
+
+  Q_PROPERTY(bool viewshedVisible READ isViewshedVisible WRITE setViewshedVisible NOTIFY viewshedVisibleChanged)
+  Q_PROPERTY(bool frustumVisible READ isFrustumOutlineVisible WRITE setFrustumOutlineVisible NOTIFY frustumVisibleChanged)
+  Q_PROPERTY(double minDistance READ minDistance WRITE setMinDistance NOTIFY minDistanceChanged)
+  Q_PROPERTY(double maxDistance READ maxDistance WRITE setMaxDistance NOTIFY maxDistanceChanged)
+  
+
+  bool isViewshedVisible() const;
+  void setViewshedVisible(bool viewshedVisible);
+
+  bool isFrustumOutlineVisible() const;
+  void setFrustumOutlineVisible(bool frustumVisible);
+
+  double minDistance() const;
+  void setMinDistance(double minDistance);
+
+  double maxDistance() const;
+  void setMaxDistance(double maxDistance);
+
+  
+signals:
+  void viewshedVisibleChanged();
+  void frustumVisibleChanged();
+  void minDistanceChanged();
+  void maxDistanceChanged();
+  
+
+private:
+  void connectSignals();
+  void setInitialViewpoint();
+  void createViewshed(double x, double y);
+
+  Esri::ArcGISRuntime::SceneGraphicsView *m_sceneView = nullptr;
+  Esri::ArcGISRuntime::LocationViewshed  *m_locationViewshed[3] = { nullptr, nullptr, nullptr };
+  Esri::ArcGISRuntime::AnalysisOverlay   *m_analysisOverlay = nullptr;
+
+  bool m_viewshedVisible = true;
+  bool m_frustumVisible = false;
+  double m_minDistance = 50;
+  double m_maxDistance = 1000;
+  double m_horizontalAngle = 45;
+  double m_veriticalAngle = 90;
+  double m_heading = 0;
+  double m_pitch = 90;
+  bool m_calculating = false;
+};
+
+#endif // VIEWSHEDLOCATION_H