Synchronize selection of model navigator and active (model) editor

...g.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings

...rtiss/tooling/base/ui/editor/CommonDiagramEditorBase.java

...src/org/fortiss/tooling/kernel/ui/internal/views/.ratings

...s/tooling/kernel/ui/internal/views/NavigatorViewPart.java

...kernel.ui/src/org/fortiss/tooling/kernel/ui/util/.ratings

...rc/org/fortiss/tooling/kernel/ui/util/SelectionUtils.java