video: better extension extraction for explicit video info (use format
if ext is unknown)
improved support for _pywbvid=html, forces generic html player over yt
player, better deletion of ytplayer
video work: improved yt handling:
- disable yt using yt api, for forced html/flash, diable on load
- use yt error event to detect error
- better fallback on recorded video
use seperate cache for range and video info tracking
fix yt rules query to account for & and ?