Merge feature/qt6-migration-basis-modules-services into feature/qt6-migration-basis-modules

Resolves 17 conflicts against legacy Qt5 semantics; validates with BUILD_RTI=ON BUILD_GRANTLEE=ON.

qt6-after/qt6-migrated-legatus/.forward-declarations/include/AdlerJson/adler_export.h

@@ -0,0 +1,22 @@
+/**
+  * Export definitions
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Hanna E. Rathje, SLSE, 2015-08-04
+  */
+#pragma once
+
+#include <QtCore/qglobal.h>
+
+#ifndef SAATELEGRAMS_EXPORT
+# ifdef BUILD_STATIC_LIBRARIES
+#  define SAATELEGRAMS_EXPORT
+# else
+#  if defined(MAKE_SAATELEGRAMS_LIB)
+#   define SAATELEGRAMS_EXPORT Q_DECL_EXPORT
+#  else
+#   define SAATELEGRAMS_EXPORT Q_DECL_IMPORT
+#  endif
+# endif
+#endif