Youtube-dl

Core
* [extractor/common] Improve _json_ld for articles
* Switch codebase to use compat_b64decode
+ [compat] Add compat_b64decode

Extractors
+ [seznamzpravy] Add support for seznam.cz and seznamzpravy.cz (14102, 14616)
* [dplay] Bypass geo restriction
+ [dplay] Add support for disco-api videos (15396)
* [youtube] Extract precise error messages (15284)
* [teachertube] Capture and output error message
* [teachertube] Fix and relax thumbnail extraction (15403)
+ [prosiebensat1] Add another clip id regular expression (15378)
* [tbs] Update tokenizer url (15395)
* [mixcloud] Use compat_b64decode (15394)
- [thesixtyone] Remove extractor (15341)

Core
* [extractor/common] Improve jwplayer DASH formats extraction (9242, 15187)
* [utils] Improve scientific notation handling in js_to_json (14789)

Extractors
+ [southparkdk] Add support for southparkstudios.nu
+ [southpark] Add support for collections (14803)
* [franceinter] Fix upload date extraction (14996)
+ [rtvs] Add support for rtvs.sk (9242, 15187)
* [restudy] Fix extraction and extend URL regular expression (15347)
* [youtube:live] Improve live detection (15365)
+ [springboardplatform] Add support for springboardplatform.com
* [prosiebensat1] Add another clip id regular expression (15290)
- [ringtv] Remove extractor (15345)

Extractors
* [soundcloud] Update client id (15306)
- [kamcord] Remove extractor (15322)
+ [spiegel] Add support for nexx videos (15285)
* [twitch] Fix authentication and error capture (14090, 15264)
* [vk] Detect more errors due to copyright complaints (15259)

Extractors
* [youtube] Fix live streams extraction (15202)
* [wdr] Bypass geo restriction
* [wdr] Rework extractors (14598)
+ [wdr] Add support for wdrmaus.de/elefantenseite (14598)
+ [gamestar] Add support for gamepro.de (3384)
* [viafree] Skip rtmp formats (15232)
+ [pandoratv] Add support for mobile URLs (12441)
+ [pandoratv] Add support for new URL format (15131)
+ [ximalaya] Add support for ximalaya.com (14687)
+ [digg] Add support for digg.com (15214)
* [limelight] Tolerate empty pc formats (15150, 15151, 15207)
* [ndr:embed:base] Make separate formats extraction non fatal (15203)
+ [weibo] Add extractor (15079)
+ [ok] Add support for live streams
* [canalplus] Fix extraction (15072)
* [bilibili] Fix extraction (15188)

Core
* [utils] Fix youtube-dl under PyPy3 on Windows
* [YoutubeDL] Output python implementation in debug header

Extractors
+ [jwplatform] Add support for multiple embeds (15192)
* [mitele] Fix extraction (15186)
+ [motherless] Add support for groups (15124)
* [lynda] Relax URL regular expression (15185)
* [soundcloud] Fallback to avatar picture for thumbnail (12878)
* [youku] Fix list extraction (15135)
* [openload] Fix extraction (15166)
* [lynda] Skip invalid subtitles (15159)
* [twitch] Pass video id to url_result when extracting playlist (15139)
* [rtve.es:alacarta] Fix extraction of some new URLs
* [acast] Fix extraction (15147)

Core
+ [extractor/common] Add container meta field for formats extracted
in _parse_mpd_formats (13616)
+ [downloader/hls] Use HTTP headers for key request
* [common] Use AACL as the default fourcc when AudioTag is 255
* [extractor/common] Fix extraction of DASH formats with the same
representation id (15111)

Extractors
+ [slutload] Add support for mobile URLs (14806)
* [abc:iview] Bypass geo restriction
* [abc:iview] Fix extraction (14711, 14782, 14838, 14917, 14963, 14985,
15035, 15057, 15061, 15071, 15095, 15106)
* [openload] Fix extraction (15118)
- [sandia] Remove extractor
- [collegerama] Remove extractor
+ [mediasite] Add support for sites based on Mediasite Video Platform (5428,
11185, 14343)
+ [ufctv] Add support for ufc.tv (14520)
* [pluralsight] Fix missing first line of subtitles (11118)
* [openload] Fallback on f-page extraction (14665, 14879)
* [vimeo] Improve password protected videos extraction (15114)
* [aws] Fix canonical/signed headers generation on python 2 (15102)