The crop action in impress is defined in impress but uses code shared in
svx. This patch move the declaration of the Crop action in svx so that
it can be shared with sc & writer.

This is part of a serie of 4 patches that adds Save graphic, Change Picture,
Edit with external tool, Crop (by handles) in all products (scalc, sdraw,
simpress, swriter).
Main menus, toolbars and contextual menus are updated accordingly.


Change-Id: Idb6907aa09c0efd456c2ad51232cf37edb28d977
Reviewed-on: https://gerrit.libreoffice.org/15587Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>