Adds Crop (by handles) to writer. Proposal of new Format menu and image
context menu organisation.

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: I6fe8907e08519326c78f0bc71f27032b5716bb8e
Reviewed-on: https://gerrit.libreoffice.org/15590Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan Holesovsky <kendy@collabora.com>