Pragy-dl

* **Improve output template:**
* Objects can be traversed like `%(field.key1.key2)s`
* An offset can be added to numeric fields as `%(field+N)s`
* Deprecates `--autonumber-start`
* **Improve `--sub-langs`:**
* Treat `--sub-langs` entries as regex
* `all` can be used to refer to all the subtitles
* language codes can be prefixed with `-` to exclude it
* Deprecates `--all-subs`
* Add option `--ignore-no-formats-error` to ignore the "no video format" and similar errors
* Add option `--skip-playlist-after-errors` to skip the rest of a playlist after a given number of errors are encountered
* Merge youtube-dl: Upto [commit/7e8b3f9](https://github.com/ytdl-org/youtube-dl/commit/7e8b3f9439ebefb3a3a4e5da9c0bd2b595976438)
* [downloader] Fix bug in downloader selection
* [BilibiliChannel] Fix pagination by [nao20010128nao](https://github.com/nao20010128nao) and [pukkandan](https://github.com/pukkandan)
* [rai] Add support for http formats by [nixxo](https://github.com/nixxo)
* [TubiTv] Add TubiTvShowIE by [Ashish0804](https://github.com/Ashish0804)
* [twitcasting] Fix extractor
* [viu:ott] Fix extractor and support series by [lkho](https://github.com/lkho) and [pukkandan](https://github.com/pukkandan)
* [youtube:tab] Show unavailable videos in playlists by [coletdjnz](https://github.com/coletdjnz)
* [youtube:tab] Reload with unavailable videos for all playlists
* [youtube] Ignore invalid stretch ratio
* [youtube] Improve channel syncid extraction to support ytcfg by [coletdjnz](https://github.com/coletdjnz)
* [youtube] Standardize API calls for tabs, mixes and search by [coletdjnz](https://github.com/coletdjnz)
* [youtube] Bugfix in `_extract_ytcfg`
* [mildom:user:vod] Download only necessary amount of pages
* [mildom] Remove proxy completely by [fstirlitz](https://github.com/fstirlitz)
* [go] Fix `_VALID_URL`
* [MetadataFromField] Improve regex and add tests
* [Exec] Ensure backward compatibility when the command contains `%`
* [extractor] Fix inconsistent use of `report_warning`
* Ensure `mergeall` selects best format when multistreams are disabled
* Improve the pragy-dl.sh script by [fstirlitz](https://github.com/fstirlitz)
* [lazy_extractor] Do not load plugins
* [ci] Disable fail-fast
* [docs] Clarify which deprecated options still work
* [docs] Fix typos

* Add option `--convert-thumbnails` (only jpg currently supported)
* Format selector `mergeall` to download and merge all formats
* Pass any field to `--exec` using similar syntax to output template
* Choose downloader for each protocol using `--downloader PROTO:NAME`
* Alias `--downloader` for `--external-downloader`
* Added `native` as an option for the downloader
* Merge youtube-dl: Upto [commit/4fb25ff](https://github.com/ytdl-org/youtube-dl/commit/4fb25ff5a3be5206bb72e5c4046715b1529fb2c7) (except vimeo)
* [DiscoveryPlusIndia] Add DiscoveryPlusIndiaShowIE by [Ashish0804](https://github.com/Ashish0804)
* [NFHSNetwork] Add extractor by [llacb47](https://github.com/llacb47)
* [nebula] Add extractor (watchnebula.com) by [hheimbuerger](https://github.com/hheimbuerger)
* [nitter] Fix extraction of reply tweets and update instance list by [B0pol](https://github.com/B0pol)
* [nitter] Fix thumbnails by [B0pol](https://github.com/B0pol)
* [youtube] Fix thumbnail URL
* [youtube] Parse API parameters from initial webpage by [coletdjnz](https://github.com/coletdjnz)
* [youtube] Extract comments' approximate timestamp by [coletdjnz](https://github.com/coletdjnz)
* [youtube] Fix alert extraction
* [bilibili] Fix uploader
* [utils] Add `datetime_from_str` and `datetime_add_months` by [coletdjnz](https://github.com/coletdjnz)
* Run some `postprocessors` before actual download
* Improve argument parsing for `-P`, `-o`, `-S`
* Fix some `m3u8` not obeying `--allow-unplayable-formats`
* Fix default of `dynamic_mpd`
* Deprecate `--all-formats`, `--include-ads`, `--hls-prefer-native`, `--hls-prefer-ffmpeg`
* [docs] Improvements

* Merge youtube-dl: Upto [commit/654b4f4](https://github.com/ytdl-org/youtube-dl/commit/654b4f4ff2718f38b3182c1188c5d569c14cc70a)
* Ability to set a specific field in the file's metadata using `--parse-metadata`
* Ability to select n'th best format like `-f bv*.2`
* [DiscoveryPlus] Add discoveryplus.in
* [la7] Add podcasts and podcast playlists by [nixxo](https://github.com/nixxo)
* [mildom] Update extractor with current proxy by [nao20010128nao](https://github.com/nao20010128nao)
* [ard:mediathek] Fix video id extraction
* [generic] Detect Invidious' link element
* [youtube] Show premium state in `availability` by [coletdjnz](https://github.com/coletdjnz)
* [viewsource] Add extractor to handle `view-source:`
* [sponskrub] Run before embedding thumbnail
* [docs] Improve `--parse-metadata` documentation

* Revert [commit/8562218](https://github.com/ytdl-org/youtube-dl/commit/8562218350a79d4709da8593bb0c538aa0824acf)

* 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)