* Calling the API with `clientScreen=EMBED` allows access to most age-gated videos - discovered by @ccdffddfddfdsfedeee (https://github.com/yt-dlp/yt-dlp/issues/574#issuecomment-887171136)
* Adds clients: (web/android/ios)_(embedded/agegate), mweb_embedded
* Renamed mobile_web to mweb
Closes#574
Authored by pukkandan, MinePlayersPE