[ytdl] Handle url in data uri scheme

[mozbugbox]

There are site return inline data in URL in data-URI scheme as m3u8
playlist:

data:mime/type;base64,dafjodfjia

Try to handle this kind of url.

Still pause between .ts segments

sample url: http://www.le.com/ptv/vplay/27002214.html

I agree that my changes can be relicensed to LGPL 2.1 or later.

[ghost]

@ChrisK2 @wiiaboo any opinions about this?

[wiiaboo]

FFmpeg can handle data URIs directly, turns out, so it doesn't need special handling by mpv.