youtube-dl: updated to 20200124

version 2020.01.24

Extractors
* [youtube] Fix sigfunc name extraction
* [stretchinternet] Fix extraction
* [voicerepublic] Fix extraction
* [azmedien] Fix extraction
* [businessinsider] Fix jwplatform id extraction
+ [24video] Add support for 24video.vip
* [ivi:compilation] Fix entries extraction
* [ard] Improve extraction
    * Simplify extraction
    + Extract age limit and series
    * Bypass geo-restriction
+ [nbc] Add support for nbc multi network URLs
* [americastestkitchen] Fix extraction
* [zype] Improve extraction
    + Extract subtitles
    + Support URLs with alternative keys/tokens
    + Extract more metadata
* [orf:tvthek] Improve geo restricted videos detection
* [soundcloud] Restore previews extraction

(adam)