Parse media thumbnails inside media group tag. #51
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YouTube has a somewhat unique RSS feed style for thumbnails. It embeds thumbnails inside a media:group. (see https://www.youtube.com/feeds/videos.xml?channel_id=UCAL3JXZSzSm8AlZyD3nQdBA)
This change treats media:thumbnail inside media:group much like media:title and media:description inside media:group. All elements are searched for media:thumbnail, not just direct children of media.