Storehouse's own metadata editor (Storehouse.Image.MetadataEditor), in
Elixir, with no dependency: JPEG (Storehouse.Image.JPEG), PNG
(Storehouse.Image.PNG) and WebP (Storehouse.Image.WebP), each reading only a
file's metadata into memory and copying its image data from file to
file. Other types (HEIC, AVIF, TIFF, a camera's raw files) are
:unsupported: an editor around ExifTool edits those.
