[youtube] New params for get_video_info (#1423)
[youtube] New params for get_video_info (#1423)

* [youtube] New params for get_video_info

- removed double import
- use https
- detailpage for normal videos
- embedded as a fallback for age-restricted videos

Fixed streamlink/streamlink#1421

* [youtube] Better error messages for get_video_info

* [youtube] Removed the double call for parse_query

* [youtube] update for embedded restricted videos

back-to/streamlink,wlerin/streamlink,chhe/streamlink,back-to/streamlink,streamlink/streamlink,javiercantero/streamlink,gravyboat/streamlink,melmorabity/streamlink,gravyboat/streamlink,wlerin/streamlink,javiercantero/streamlink,chhe/streamlink,melmorabity/streamlink,streamlink/streamlink,bastimeyer/streamlink,beardypig/streamlink,beardypig/streamlink,bastimeyer/streamlink