Add extractor for teletask
fix test and remove lengthy description
[teletask] Add new extractor
Merge pull request #4553 from tobidope/gameone

[gameone] This fix resolves issue #4552
[gameone] Extract duration as float
[sohu] Modernize and extract all formats and more metadata (Closes #4409, closes #2056, closes #3009)
Merge branch 'teletask' of https://github.com/MaxReimann/youtube-dl into MaxReimann-teletask
[teletask] Simplify
Merge branch 'MaxReimann-teletask'
Credit @MaxReimann for teletask (#4533)