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- Widget implementation and all widgets from zope.app.form have been
moved into zope.formlib, breaking zope.formlib's dependency on
zope.app.form (instead zope.app.form now depends on zope.formlib).
Widgets can all be imported from ``zope.formlib.widgets``.
Widget base classes and render functionality is in
``zope.formlib.widget``.
All relevant widget interfaces are now in ``zope.formlib.interfaces``.