multi-page: add a shape file that greys out the overlayed area between pages
multi-page: add a shape file that greys out the overlayed area between pages

Signed-off-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@free-electrons.com>

maposmatic/ocitysmap,dittaeva/ocitysmap,maposmatic/ocitysmap,dittaeva/ocitysmap,maposmatic/ocitysmap