Updated extension to work with latest YouTube API#1

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Venryx wants to merge 2 commits intoRobotCopy:masterfrom

Commits on Mar 1, 2022

* Fixed getYouTubeCaptionURL() to work with latest YouTube code. (which does not have the get_video_info endpoint, but instead includes that info in the page itself)
Venryx
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* Fixed that the retrieval of youtube captions would only work for the "initial-load video". (eg. clicking on another video would keep using the old caption-data)
Venryx
committed