Complete Qt6 migration: full clean build green across groups G1-G12 incl. runtime plugin set

new_docker_build.sh gains Group 12 (212 GUI/Data plugins); fixes LtsUtilsGuiDds visibility (LTO-stripped exports), LtsProjectionWorkstation unity name shadow, 6 unity-off dirs (dup file-scope statics, ddsftc INTERFACE sources) and reconfigures BUILD_FILTERMANAGEMENT/BUILD_PLUGINS_SERVICEMONITOR=ON

qt6-after/qt6-migrated-legatus/Lts/Viewer/SituationMap/MapImpl/viewshed_base.h

@@ -0,0 +1,62 @@
+/**
+  * @RDE_HEADER@
+  * Baseclass of Viewsheds
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+#pragma once
+
+// Own
+#include <Common/situation_map_logging.h>
+
+// ESRI
+#include <Map.h>
+#include <SpatialReference.h>
+
+
+// Qt
+#include <QObject>
+#include <QColor>
+#include <QPointF>
+
+// forward:
+namespace Esri
+{
+namespace ArcGISRuntime
+{
+class Map;
+class Graphic;
+class GraphicsOverlay;
+class GeoprocessingTask;
+class GeoprocessingResult;
+}
+}
+
+
+//----------------------------------------------------------------------------
+namespace SituationMap
+{
+
+
+class ViewshedBase : public QObject
+{
+  Q_OBJECT
+
+public:
+
+  explicit ViewshedBase(QObject *parent = nullptr);
+  virtual ~ViewshedBase() = default;
+
+  ViewshedBase(const ViewshedBase &other)      = delete;
+  ViewshedBase &operator=(ViewshedBase &other) = delete;
+
+  virtual bool execute(const QPointF &viewshedPoint_map, double outerRadius, double observerOffset) = 0;
+
+};
+
+
+
+} // namespace SituationMap
+