Add support for VK.com

[headmaster999999]

This extension is very wonderful!!! However, it doesn't seem to be compatible with VK.com (VK video). It recognizes that a video is playing, but doesn't load subtitles (or allow files to even be selected).

[headmaster999999]

While subtitles aren't able to be loaded in the video player, it seems the process as a whole does partly work. The "No subtitles loaded" dialogue doesn't appear in the video player itself, bit it does seem to appear on thumbnails--interestingly! (example attached)

[gignupg]

Interesting! I'll try to add it some time in the future when I have more time!