Update Niconama support

[AlexAplin]

Resolves #11. This also fixes get_media_from_manifest to actually respect the media type.

• -c is not supported
• On-air namas still don't work and might be troublesome to support. We'll likely need to pass cookies through on players down to ffmpeg -headers. This adds a warning to follow that work in On-air Niconama stream links #203
• Better warnings when -an/-aq or -vn/-vq are specified together

[fireattack]

This needs to be replaced by the highest quality that is acquired from params (params['program']['stream']['maxQuality']) because super_high is no longer the best quality for years (we have 6m and 12m now).

[AlexAplin]

Is 12Mbps exclusive to some type of user/broadcast type? I tried setting up a broadcast now on premium and it seems the max is 6.

[fireattack]

Probably only the "official" ones can do. I can't find a 12M rn but here is a 8M one: https://live.nicovideo.jp/watch/lv347308094

Also note that the actual bitrate is often much lower.

[fireattack]

I can help writing the comment downloading function once you're done. I have a working one myself.

Do note the proto schema data is directly copied from https://github.com/tsukumijima/NDGRClient (MIT) which was imported from https://github.com/n-air-app/nicolive-comment-protobuf (also MIT); I don't dump them myself.