Yt-dlp

* [Akamai] fix by [nixxo](https://github.com/nixxo)
* [Tiktok] merge youtube-dl tiktok extractor by [GreyAlien502](https://github.com/GreyAlien502)
* [vlive] add support for playlists by [kyuyeunk](https://github.com/kyuyeunk)
* [youtube_live_chat] make sure playerOffsetMs is positive by [siikamiika](https://github.com/siikamiika)
* Ignore extra data streams in ffmpeg by [jbruchon](https://github.com/jbruchon)
* Allow passing different arguments to different postprocessors using `--postprocessor-args`
* Deprecated `--sponskrub-args`. The same can now be done using `--postprocessor-args "sponskrub:<args>"`
* [CI] Split tests into core-test and full-test

* **Changed defaults:**
* Enabled `--ignore`
* Disabled `--video-multistreams` and `--audio-multistreams`
* Changed default format selection to `bv*+ba/b` when `--audio-multistreams` is disabled
* Changed default format sort order to `res,fps,codec,size,br,asr,proto,ext,has_audio,source,format_id`
* Changed `webm` to be more preferable than `flv` in format sorting
* Changed default output template to `%(title)s [%(id)s].%(ext)s`
* Enabled `--list-formats-as-table`

* **Features from [animelover1984/youtube-dl](https://github.com/animelover1984/youtube-dl)**: by [animelover1984](https://github.com/animelover1984) and [bbepis](https://github.com/bbepis)
* Add `--get-comments`
* [youtube] Extract comments
* [billibilli] Added BiliBiliSearchIE, BilibiliChannelIE
* [billibilli] Extract comments
* [billibilli] Better video extraction
* Write playlist data to infojson
* [FFmpegMetadata] Embed infojson inside the video
* [EmbedThumbnail] Try embedding in mp4 using ffprobe and `-disposition`
* [EmbedThumbnail] Treat mka like mkv and mov like mp4
* [EmbedThumbnail] Embed in ogg/opus
* [VideoRemuxer] Conditionally remux video
* [VideoRemuxer] Add `-movflags +faststart` when remuxing to mp4
* [ffmpeg] Print entire stderr in verbose when there is error
* [EmbedSubtitle] Warn when embedding ass in mp4
* [anvato] Use NFLTokenGenerator if possible
* **Parse additional metadata**: New option `--parse-metadata` to extract additional metadata from existing fields
* The extracted fields can be used in `--output`
* Deprecated `--metadata-from-title`
* [Audius] Add extractor
* [youtube] Extract playlist description and write it to `.description` file
* Detect existing files even when using `recode`/`remux` (`extract-audio` is partially fixed)
* Fix wrong user config from v2021.01.24
* [youtube] Report error message from youtube as error instead of warning
* [FormatSort] Fix some fields not sorting from v2021.01.24
* [postprocessor] Deprecate `avconv`/`avprobe`. All current functionality is left untouched. But don't expect any new features to work with avconv
* [postprocessor] fix `write_debug` to not throw error when there is no `_downloader`
* [movefiles] Don't give "cant find" warning when move is unnecessary
* Refactor `update-version`, `pyinst.py` and related files
* [ffmpeg] Document more formats that are supported for remux/recode

* 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

* [TrovoLive] Add extractor (only VODs)
* [pokemon] Add `//player` URLs
* Improved parsing of multiple postprocessor-args, add `--ppa` as alias
* [EmbedThumbnail] Simplify embedding in mkv
* [sponskrub] Encode filenames correctly, better debug output and error message
* [readme] Cleanup options

* Merge youtube-dl: Upto [2021.01.16](https://github.com/ytdl-org/youtube-dl/releases/tag/2021.01.16)
* **Configuration files:**
* Portable configuration file: `./yt-dlp.conf`
* Allow the configuration files to be named `yt-dlp` instead of `youtube-dlc`. See [this](https://github.com/yt-dlp/yt-dlp#configuration) for details
* Add PyPI release