Add support for PorCore

[pepoluan]

Checklist

• I'm reporting a new site support request
• I've verified that I'm running youtube-dl version 2020.06.16.1
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that none of provided URLs violate any copyrights
• I've searched the bugtracker for similar site support requests including closed ones

Example URLs

• Single video: https://porcore.com/video/915/the-capture-of-the-asuka/
• Single video: https://porcore.com/video/1026/las-plagas/
• Single video: https://porcore.com/video/1080/no-gods-no-kings/
• Playlist: Site does NOT provide playlist facility.

Description

Site seems to be a completely free site; no registration/login page is available at all.

Some video makers seem to use this site to publish their videos.

(The following is copied from the site's About page)

Porcore has been started in the end of 2016 as a new project devoted to non-stardad and non-usual porn videos, which are created with computer graphics only!

Initially, it began as a spin-off from Gamcore, which contained both sex games and sex videos.

Currently there is absolutely no relation to any other projects and Porcore is living on his own. Porcore is about virtual sex videos only!