h264 disables high quality

[ImprovedTube]

instead of only marking red impossible options, one could
also add to the items: "(Can't h.264 codec and this quality)"

https://github.com/code-charity/youtube/blob/ed6e16e1167af3827f5967ffec025c7589f15b4c/menu/skeleton-parts/player.js#L760-L796

• [ ] And or we can just flip the h.264 switch like this, when such quality is clicked:

https://github.com/code-charity/youtube/blob/ed6e16e1167af3827f5967ffec025c7589f15b4c/menu/skeleton-parts/player.js#L49-L60

• [ ] and let's add a spotlight effect every time any switch is pragramatically flipped like that (this one will be visible at the time. - And others may be too in future, if we make a fullscreen settings page fitting all toggles.)