[AF3] Add auto-layout to AF3 LWFXE component editor.
Since the old graphical editor for components is replaced with a new one
based on LWFXEF,
the auto-layout functionality should also be included.
See the old component editor for the auto-layout context menu entry and
include a similar
function based on the Eclipse ELK framework.
(from redmine: issue id 3872, created on 2019-11-26)