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.cpp

@@ -0,0 +1,27 @@
+/**
+  * @RDE_HEADER@
+  * Baseclass of Viewsheds
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+// Own
+#include "viewshed_base.h"
+
+
+// Qt
+
+
+namespace SituationMap
+{
+
+//-----------------------------------------------------------------------------
+// class ViewshedBase
+//-----------------------------------------------------------------------------
+ViewshedBase::ViewshedBase(QObject *parent)
+  : QObject(parent)
+{}
+
+
+} // namespace SituationMap