Fix/Improvements for Upskill Courses (Isolate Teachable methods, group by Chapter and new link structure)

[leocaseiro]

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What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl for upskillcourse extractor)
• Feature request (request for a new functionality): adding chapters for upskillcourse

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Teachable websites

Upskill (http://upskillcourses.com/) is part of the https://teachable.com/ Learning Courses Websites, so we could isolate its methods to be reused in other websites such as ultimateangular.com, and the examples http://learn.vrdev.school/?src=teachable-examples or http://courses.every-tuesday.com/p/brush-lettering-with-watercolor/?src=teachable-examples.

I'm not a python developer, but I'd suggest creating an abstract class (or similar within Python syntax) and them the upskill would extend abstract teachable extractor class and set its URL formats and some specific names if needed to.

link with /p/ calling generic instead

The link http://upskillcourses.com/p/essential-web-developer-course is not being recognized by youtube-dl, only the link http://upskillcourses.com/courses/enrolled/119763

Group videos by chapter

Teachable websites have chapters and it would be nice be able to save videos within subfolders from its chapters. As well as use on -o to rename files, like: %(chapter_number)s and/or %(chapter)s

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Below I set a list of the fix/improvements mentioned in this issue:

• Isolate Teachable Methods (DRY)
• Enable new link url.com/p/course-name (Eq: http://upskillcourses.com/p/essential-web-developer-course)
• Group Chapters and create folders with its names

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Possible related issues

#13043
#13203

[leocaseiro]

done at CommanderRoot/youtube-dl@5402850