plugins.vkplay: new plugin

[Inokenty90]

Plugin to support live streaming on vkplay.live

streamlink https://vkplay.live/sguhoman
[cli][info] Found matching plugin vkplay for URL https://vkplay.live/sguhoman
[cli][info] Available streams: 240p (worst), 360p, 480p, 720p, 1080p (best)

[bastimeyer]

Thanks for the PR. Adding a plugin for this site should be fine.

However, some code clean up needs to be done here first before this can be merged. Allow me to add some changes to your PR branch, so this doesn't get unnecessarily complicated. I will also add support for API error messages and for stream metadata.

[bastimeyer]

Metadata:

$ streamlink 'https://vkplay.live/d3l_by' best -j | jq .metadata
{
  "id": "4462052257156",
  "author": "d3l_by",
  "category": "Говорим и смотрим",
  "title": "ВЛОГ2 уже на ютубе!"
}

Offline:

$ streamlink 'https://vkplay.live/sguhoman'
[cli][info] Found matching plugin vkplay for URL https://vkplay.live/sguhoman
error: No playable streams found on this URL: https://vkplay.live/sguhoman

Non-existent:

$ streamlink 'https://vkplay.live/foo'
[cli][info] Found matching plugin vkplay for URL https://vkplay.live/foo
[plugins.vkplay][error] Blog not found
error: No playable streams found on this URL: https://vkplay.live/foo

[mkbloke]

Looks good to me.