Added fallback to ImageMagick's legacy utilities
Added fallback to ImageMagick's legacy utilities

When the `magick` binary is not available, artresizer will fall back
to the "legacy" binaries (`convert`, `identify`, etc.)

shamangeorge/beets,beetbox/beets,ibmibmibm/beets,sampsyo/beets,jackwilsdon/beets,shamangeorge/beets,sampsyo/beets,shamangeorge/beets,ibmibmibm/beets,SusannaMaria/beets,SusannaMaria/beets,sampsyo/beets,SusannaMaria/beets,beetbox/beets,SusannaMaria/beets,shamangeorge/beets,jackwilsdon/beets,beetbox/beets,sampsyo/beets,ibmibmibm/beets,jackwilsdon/beets,jackwilsdon/beets,ibmibmibm/beets,beetbox/beets