Download more metadata from SVT Play

[ChlorideCull]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.11.07. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x] I've verified and I assure that I'm running youtube-dl 2018.11.07

Before submitting an issue make sure you have:

• [x] At least skimmed through the README, most notably the FAQ and BUGS sections
• [x] Searched the bugtracker for similar issues including closed ones
• [x] Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• [ ] Bug report (encountered problems with youtube-dl)
• [ ] Site support request (request for adding support for a new site)
• [x] Feature request (request for a new functionality)
• [ ] Question
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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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Description of your issue, suggested solution and other information

The extractor for SVT Play doesn't grab all metadata, most notably description, season_number, and episode_number. It's available in the root['__svtplay'] JSON object that's already grabbed by the extractor, under "videoPage" > "video", under the names description, season, and episodeNumber.

This is a relatively simple change, I'll probably fix it myself if no one else gets to it first.

Here's an episode with these properties, for convenience.

[ChlorideCull]

Apparently there's an API, as used by the unofficial Kodi addon, which can be used instead of scraping the site.

I'll rewrite the extractor to use the API instead of scraping the pages when I have time.