Log Message:
youtube-dl: Update to 20201214

Changes:
version 2020.12.14

Core
* [extractor/common] Improve JSON-LD interaction statistic extraction (#23306)
* [downloader/hls] Delegate manifests with media initialization to ffmpeg
+ [extractor/common] Document duration meta field for playlists

Extractors
* [mdr] Bypass geo restriction
* [mdr] Improve extraction (#24346, #26873)
* [yandexmusic:album] Improve album title extraction (#27418)
* [eporner] Fix view count extraction and make optional (#23306)
+ [eporner] Extend URL regular expression
* [eporner] Fix hash extraction and extend _VALID_URL (#27396)
* [slideslive] Use m3u8 entry protocol for m3u8 formats (#27400)
* [twitcasting] Fix format extraction and improve info extraction (#24868)
* [linuxacademy] Fix authentication and extraction (#21129, #26223, #27402)
* [itv] Clean description from HTML tags (#27399)
* [vlive] Sort live formats (#27404)
* [hotstart] Fix and improve extraction
    * Fix format extraction (#26690)
    + Extract thumbnail URL (#16079, #20412)
    + Add support for country specific playlist URLs (#23496)
    * Select the last id in video URL (#26412)
+ [youtube] Add some invidious instances (#27373)