[Xvideos] Download user profiles

[master-leonardo]

Checklist

• I'm reporting a site feature request
• I've verified that I'm running youtube-dl version 2019.06.17
• I've searched the bugtracker for similar site feature requests including closed ones

Description

Right now we can only download single xvideos videos, i'd like to suggest to be able to download full profiles.

Example URLs

• Profile: https://www.xvideos.com/profiles/USERNAME#
• https://www.xvideos.com/amateur-channels/USERNAME#
• https://www.xvideos.com/pornstar-channels/USERNAME#
• Vigeos Page: https://www.xvideos.com/profiles/USERNAME#_tabVideos
  https://www.xvideos.com/amateur-channels/USERNAME#_tabVideos
  https://www.xvideos.com/pornstar-channels/USERNAME#_tabVideos
• Single Video: https://www.xvideos.com/videoID/VIDEONAME (already supported)
  But if we navigate through the videos pages, it's like this:
• https://www.xvideos.com/profiles/USERNAME#0 = page 1
• https://www.xvideos.com/amateur-channels/USERNAME#0 = page 1
• https://www.xvideos.com/pornstar-channels/USERNAME#2 = page 3
• https://www.xvideos.com/profiles/USERNAME#7 = page 8
  ...
• https://www.xvideos.com/profiles/USERNAME#10 = page 11
  even though the address bar does not change it's url.

Here is an example with a user with plenty of pages on their profiles
https://www.xvideos.com/pornstar-channels/mia-khalifa#_tabVideos

[master-leonardo]

@dstftw
I edited this, does now looks fine?