Added CompositView, which implements both View and ViewLayout, for combining Views to one Widget. The layout can be set
to either horizontal or vertical. SearchView, RefreshView and UndoRedoView are combined to one DockWidget by the
ComponentManager now.
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This change moves nested layouting of the Graph to GraphController. The DummyNodes get the correct size assigned, as
well as a visible flag. Mouse interaction with the Graph is now handled via the GraphController, which makes it
easier to undo them or reuse the changed state after graph updates.
Eberhard Graether