css.lang: Add nwse-resize (cursor) property value
css.lang: Add nwse-resize (cursor) property value

This adds the nwse-resize keyword to the property-values context.

https://bugzilla.gnome.org/show_bug.cgi?id=795552

GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview