The cpn param, aka the content playback nonce param, is a parameter sent by YouTube web client in videoplayback requests, and for some of them, in the player request body. This PR adds it everywhere.
For the desktop/WEB client, some params were missing from the playbackContext object, which seemed (or not) to make YouTube throttle streams extracted from the WEB client. This PR adds them.
Fingerprinting on the WEB client basing on the client version used is not possible anymore, because the latest client version is extracted at the first time of a YouTube request on a session which require the extractor to fetch again the website (and this may come back the reCaptcha issues again unfortunately, but it seems there is no other way to get it).
For the Android client, the video id is now also sent as a query parameter, like a 12 characters string, in the t query parameter, in order to spoof better this client. Researches need to be done on this parameter, unique to each request, and how it is generated by clients.
This commit also fixes a small bug with the Android User-Agent string.
Some code improvements have been also made.
05b7fee23b