Log Message:
youtube-dl: Update to 20191225

Changes:
20191225
--------
Core
* [utils] Improve str_to_int
+ [downloader/hls] Add ability to override AES decryption key URL (#17521)

Extractors
* [mediaset] Fix parse formats (#23508)
+ [tv2dk:bornholm:play] Add support for play.tv2bornholm.dk (#23291)
+ [slideslive] Add support for url and vimeo service names (#23414)
* [slideslive] Fix extraction (#23413)
* [twitch:clips] Fix extraction (#23375)
+ [soundcloud] Add support for token protected embeds (#18954)
* [vk] Improve extraction
    * Fix User Videos extraction (#23356)
    * Extract all videos for lists with more than 1000 videos (#23356)
    + Add support for video albums (#14327, #14492)
- [kontrtube] Remove extractor
- [videopremium] Remove extractor
- [musicplayon] Remove extractor (#9225)
+ [ufctv] Add support for ufcfightpass.imgdge.com and
  ufcfightpass.imggaming.com (#23343)
+ [twitch] Extract m3u8 formats frame rate (#23333)
+ [imggaming] Add support for playlists and extract subtitles
+ [ufcarabia] Add support for UFC Arabia (#23312)
* [ufctv] Fix extraction
* [yahoo] Fix gyao brightcove player id (#23303)
* [vzaar] Override AES decryption key URL (#17521)
+ [vzaar] Add support for AES HLS manifests (#17521, #23299)
* [nrl] Fix extraction
* [teachingchannel] Fix extraction
* [nintendo] Fix extraction and partially add support for Nintendo Direct
  videos (#4592)
+ [ooyala] Add better fallback values for domain and streams variables
+ [youtube] Add support youtubekids.com (#23272)
* [tv2] Detect DRM protection
+ [tv2] Add support for katsomo.fi and mtv.fi (#10543)
* [tv2] Fix tv2.no article extraction
* [msn] Improve extraction
    + Add support for YouTube and NBCSports embeds
    + Add support for articles with multiple videos
    * Improve AOL embed support
    * Improve format extraction
* [abcotvs] Relax URL regular expression and improve metadata extraction
  (#18014)
* [channel9] Reduce response size
* [adobetv] Improve extaction
    * Use OnDemandPagedList for list extractors
    * Reduce show extraction requests
    * Extract original video format and subtitles
    + Add support for adobe tv embeds