[Feature] Support cover image file (cover.jpg, cover.png) in album/CD directory

[jroyvde]

Description

As mentioned in the discussion under #645 , the app doesn't currently support the detection and loading of cover image files in album directories. My own collection mostly doesn't have the cover data embedded in the music files, so I see the default "sound wave" graphic for pretty much all my albums. Would be good to see this supported as in similar music apps.

Solution

Support the automatic detection and loading of cover images in album and/or CD directories.

Some albums in my collection even have separate art for the album as a whole and the CDs within it, so a "nice to have" would be to use the image in the album directory to represent the album, and, if present, images in any subdirectories to represent each of the individual songs in those directories.

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