[YouTube] Implement emergency meta info #1135
Merged
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As seen in #1127, YouTube provides that meta info panel when users search for really sensitive content like suicide (e.g. "blue whale").
It contains:
Since NewPipe's meta infos contain only one details field, I concatenated the phone number on a new line after the phone number details.
This is how it looks in NewPipe:
Also add a test that just checks if a meta info is properly extracted. Since this test depends on #1127, this PR includes those commits, too. I will cherry-pick once #1127 is merged.
Also move meta info extraction to separate file, since YoutubeParsingHelper was longer than 2000 lines which caused checkstyle issues.