* Merge youtube-dl: Upto [2021.01.24](https://github.com/ytdl-org/youtube-dl/releases/tag/2021.01.16)
* Plugin support ([documentation](https://github.com/yt-dlp/yt-dlp#plugins))
* **Multiple paths**: New option `-P`/`--paths` to give different paths for different types of files
* The syntax is `-P "type:path" -P "type:path"`
* Valid types are: home, temp, description, annotation, subtitle, infojson, thumbnail
* Additionally, configuration file is taken from home directory or current directory
* Allow passing different arguments to different external downloaders
* [mildom] Add extractor by [nao20010128nao](https://github.com/nao20010128nao)
* Warn when using old style `--external-downloader-args` and `--post-processor-args`
* Fix `--no-overwrite` when using `--write-link`
* [sponskrub] Output `unrecognized argument` error message correctly
* [cbs] Make failure to extract title non-fatal
* Fix typecasting when pre-checking archive
* Fix issue with setting title on UNIX
* Deprecate redundant aliases in `formatSort`. The aliases remain functional for backward compatibility, but will be left undocumented
* [tests] Fix test_post_hooks
* [tests] Split core and download tests