Yt-dlp

* Merge youtube-dl: Upto 2021.03.25 ([commit/8562218](https://github.com/ytdl-org/youtube-dl/commit/8562218350a79d4709da8593bb0c538aa0824acf))
* Parse metadata from multiple fields using `--parse-metadata`
* Ability to load playlist infojson using `--load-info-json`
* Write current epoch to infojson when using `--no-clean-infojson`
* [youtube_live_chat] fix bug when trying to set cookies
* [niconico] Fix for when logged in by [CXwudi](https://github.com/CXwudi) and [xtkoba](https://github.com/xtkoba)
* [linuxacadamy] Fix login

* Merge youtube-dl: Upto [commit/7e79ba7](https://github.com/ytdl-org/youtube-dl/commit/7e79ba7dd6e6649dd2ce3a74004b2044f2182881)
* Option `--no-clean-infojson` to keep private keys in the infojson
* [aria2c] Support retry/abort unavailable fragments by [damianoamatruda](https://github.com/damianoamatruda)
* [aria2c] Better default arguments
* [movefiles] Fix bugs and make more robust
* [formatSort] Fix `quality` being ignored
* [splitchapters] Fix for older ffmpeg
* [sponskrub] Pass proxy to sponskrub
* Make sure `post_hook` gets the final filename
* Recursively remove any private keys from infojson
* Embed video URL metadata inside `mp4` by [damianoamatruda](https://github.com/damianoamatruda) and [pukkandan](https://github.com/pukkandan)
* Merge `webm` formats into `mkv` if thumbnails are to be embedded by [damianoamatruda](https://github.com/damianoamatruda)
* Use headers and cookies when downloading subtitles by [damianoamatruda](https://github.com/damianoamatruda)
* Parse resolution in info dictionary by [damianoamatruda](https://github.com/damianoamatruda)
* More consistent warning messages by [damianoamatruda](https://github.com/damianoamatruda) and [pukkandan](https://github.com/pukkandan)
* [docs] Add deprecated options and aliases in readme
* [docs] Fix some minor mistakes

* [niconico] Partial fix adapted from [animelover1984/youtube-dlb5eff52](https://github.com/animelover1984/youtube-dl/commit/b5eff52dd9ed5565672ea1694b38c9296db3fade) (login and smile formats still don't work)
* [niconico] Add user extractor by [animelover1984](https://github.com/animelover1984)
* [bilibili] Add anthology support by [animelover1984](https://github.com/animelover1984)
* [amcnetworks] Fix extractor by [2ShedsJackson](https://github.com/2ShedsJackson)
* [stitcher] Merge from youtube-dl by [nixxo](https://github.com/nixxo)
* [rcs] Improved extraction by [nixxo](https://github.com/nixxo)
* [linuxacadamy] Improve regex
* [youtube] Show if video is `private`, `unlisted` etc in info (`availability`) by [coletdjnz](https://github.com/coletdjnz) and [pukkandan](https://github.com/pukkandan)
* [youtube] bugfix for channel playlist extraction
* [nbc] Improve metadata extraction by [2ShedsJackson](https://github.com/2ShedsJackson)

* **Split video by chapters**: using option `--split-chapters`
* The output file of the split files can be set with `-o`/`-P` using the prefix `chapter:`
* Additional keys `section_title`, `section_number`, `section_start`, `section_end` are available in the output template
* **Parallel fragment downloads** by [shirt](https://github.com/shirt-dev)
* Use option `--concurrent-fragments` (`-N`) to set the number of threads (default 1)
* Merge youtube-dl: Upto [commit/3be0980](https://github.com/ytdl-org/youtube-dl/commit/3be098010f667b14075e3dfad1e74e5e2becc8ea)
* [zee5] Add Show Extractor by [Ashish0804](https://github.com/Ashish0804) and [pukkandan](https://github.com/pukkandan)
* [rai] fix drm check [nixxo](https://github.com/nixxo)
* [wimtv] Add extractor by [nixxo](https://github.com/nixxo)
* [mtv] Add mtv.it and extract series metadata by [nixxo](https://github.com/nixxo)
* [pluto.tv] Add extractor by [kevinoconnor7](https://github.com/kevinoconnor7)
* [youtube] Rewrite comment extraction by [coletdjnz](https://github.com/coletdjnz)
* [embedthumbnail] Set mtime correctly
* Refactor some postprocessor/downloader code by [pukkandan](https://github.com/pukkandan) and [shirt](https://github.com/shirt-dev)

* [youtube] Fix history, mixes, community pages and trending by [pukkandan](https://github.com/pukkandan) and [coletdjnz](https://github.com/coletdjnz)
* [youtube] Fix private feeds/playlists on multi-channel accounts by [coletdjnz](https://github.com/coletdjnz)
* [youtube] Extract alerts from continuation by [coletdjnz](https://github.com/coletdjnz)
* [cbs] Add support for ParamountPlus by [shirt](https://github.com/shirt-dev)
* [mxplayer] Rewrite extractor with show support by [pukkandan](https://github.com/pukkandan) and [Ashish0804](https://github.com/Ashish0804)
* [gedi] Improvements from youtube-dl by [nixxo](https://github.com/nixxo)
* [vimeo] Fix videos with password by [teesid](https://github.com/teesid)
* [lbry] Support `lbry://` url by [nixxo](https://github.com/nixxo)
* [bilibili] Change `Accept` header by [pukkandan](https://github.com/pukkandan) and [animelover1984](https://github.com/animelover1984)
* [trovo] Pass origin header
* [rai] Check for DRM by [nixxo](https://github.com/nixxo)
* [downloader] Fix bug for `ffmpeg`/`httpie`
* [update] Fix updater removing the executable bit on some UNIX distros
* [update] Fix current build hash for UNIX
* [docs] Include wget/curl/aria2c install instructions for Unix by [Ashish0804](https://github.com/Ashish0804)
* Fix some videos downloading with `m3u8` extension
* Remove "fixup is ignored" warning when fixup wasn't passed by user

* [build] Fix bug

* [youtube] Use new browse API for continuation page extraction by [coletdjnz](https://github.com/coletdjnz) and [pukkandan](https://github.com/pukkandan)
* Fix HLS playlist downloading by [shirt](https://github.com/shirt-dev)
* Merge youtube-dl: Upto [2021.03.03](https://github.com/ytdl-org/youtube-dl/releases/tag/2021.03.03)
* [mtv] Fix extractor
* [nick] Fix extractor by [DennyDai](https://github.com/DennyDai)
* [mxplayer] Add new extractor by [codeasashu](https://github.com/codeasashu)
* [youtube] Throw error when `--extractor-retries` are exhausted
* Reduce default of `--extractor-retries` to 3
* Fix packaging bugs by [hseg](https://github.com/hseg)