Mandown

- New source: https://mangakakalot.com
- New flag: `--supported-sites` to list available source URLs that Mandown can parse
- New flag: `--from` to only fetch and embed metadata in a local comic folder
- Requires the `--convert` flag be set
- Incompatible with the `--start` and `--end` flags (delete or temporarily move the image folders out of the target folder you don't want to achieve a similar effect)
- e.g., `mandown https://mangadex.org/manga/id --convert epub --from /path/to/already/downloaded/version`
- The `--dest` flag is now an optional argument instead of an option
- i.e., use `mandown <URL> <destination>` instead of `mandown <URL> --dest <destination>`
- Shortform options added such as `mandown -v` for `mandown --version` — see `mandown --help` for all of them

- Added metadata fields `genres` and `description` stored and embedded in epubs
- Now supports multiple authors for MangaDex and MangaSee
- The downloader skips files that are already downloaded
- Images can be force re-downloaded using `mandown.download_chapter_progress(only_needed=False)`
- Fixed a lot of bugs

- Added ebook converter for CBZ and EPUB (11)
- Available in the CLI through the `--convert [cbz|epub]` flag
- Available in the library as `mandown.converter`
- Cover art is now available
- Automatically downloaded from the CLI in `comic root/cover.jpg`
- Link available in the library as `source.metadata.cover_art`
- Folder file rename is now based on natural sorting over lexicographical sorting

- New source: https://mangadex.org
- Only supports English metadata/downloads for the time being
- Using `mandown.query()` now by populates metadata and the chapter list by default
- Using `mandown.query()` now modifies titles to have a numerical prefix to represent their proper order **only if** they originally did not sort that way
- Can be disabled by passing `populate_sort=False`
- Added `--version` flag

- Add new source https://webtoons.com
- Default to 4 concurrent downloads
- Name images in ascending numerical order

Initial "stable" release.