This plugin is a remake of a previously existing one (
https://github.com/Mimerr/comicalibre) All thanks and credit to Mimerr for the original.
I re-made it at a time when the original had fallen out of maintenance and wasn't actually working any more.
I've also added some features I wanted like multi-threading and rate-limiting.
I wrote it for my own use, but if it is of any use to anyone else, great.