Add a thumbnailer for crossword files
!61 (merged) adds MIME types for the file formats we support, but these currently show up with the generic "application" icon. We probably want a dedicated "crossword" icon for these instead.
!61 (merged) adds MIME types for the file formats we support, but these currently show up with the generic "application" icon. We probably want a dedicated "crossword" icon for these instead.