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Closes #10497, Closes #10542

Closes #10467

[downloader/dash:hls] Respect --fragment-retries and --skip-unavailable-fragments (Closes #10165, closes #10448)

Closes #10437

Closes #10445

Closes #10512

This fixes an error in _parse_html5_media_entries in case
an audio or video tag directly uses a src attribute insted
of <source> elements in it's body.

[youtube:playlist] Fallback to video extraction for video/playlist URLs when playlist is broken (Closes #10537)

It's the same video player, the only difference is that the video player
is loaded differently, and certain metadata (title and description) is
not available under dr.dk/mu, so make it by default get that from some
of the html meta tags.

Skip the dr.dk/tv test

dr.dk/tv videos are only available for between 7 and 90 days due to
Danish law, and in certain cases may be readded. Skip this test as it is
no longer available.