[Suggestion] Add artist and album pics from file

[dcaliste]

DESCRIPTION

From Sailfish OS forum: It would be nice to be able to add artist and album pics from file - not all local amateur bands show up in the search, and for some Joe Jackson albums I was offered pics of Michael Jackson’s dad.

[skygroove]

To add context to the request, my local album cover art is stored in the same folder as the flac files as png/jpeg formats, as well as having the art location embedded in the flac file.

just adding this in case examples of local “not found” art work are helpful.

[poetaster]

Downloads via ylp and campdown also include cover art of the form 'cover.jpg' and I've started to implement a backup solution. I'll PR ....