Don't set the '-aq'  option with the opus format (fixes #1263)
[arte] add an extractor for creative.arte.tv (#1593)

The +7 videos now use an independent extractor that is also used for the creative videos
[arte] Add an extractor for future.arte.tv (closes #1593)
Merge remote-tracking branch 'jaimeMF/opus-fix'
[youtube] Adds #1312 Download annotations

Adds #1321 Download annotations from youtube
Annotations are downloaded and written to a .annotations.xml file using the https://www.youtube.com/annotations_invideo?features=1&legacy=1&video_id=$VIDEOID API.
Added unit test for annotations.