Update to v2 APIs

[wacky6]

Entry point appears to be:

https://api.live.bilibili.com/xlive/web-room/v2/index/getRoomPlayInfo?room_id=<RoomID>

[wacky6]

V1 playUrl seems to be still working. Assuming response data quality field is correct

[wacky6]

v2 provides, qn=10000 （原画？）

• (proto 0?) flv: hevc/h264; H264 URL appears to agree with v1 API
• (proto 1?) m3u8: hevc/h264; Much slower TTFB

Open Q:

• Unclear if m3u8 is better (or less susceptible to jitter)
• Dual codec is suspicious. Would have go through re-encode unless source streams 2 formats (upload bw is okay now, probably okay??)

Well-known configs going through encoder (quality=3 / qn < 10000) will jank.

[wacky6]

Warn: new HLS stream m4s chunk pacing is broken in high latency situations. Guaranteed jank.