* WIP video quality selector
* The quality selector works even though it is not pretty
* Support getting and setting variant name. Closes#743
* Sort video qualities
* Fix odd looking selected states of menubutton items
* Fix comment
* Custom thumbnail poster component
* add opacity transition to thumbnail img
* fix some videoonly styles
* move video styles to video.css
* make component out of image layers; put inline styles into css
* cleanup
* update videoonly ; don't render poster if video player, remove dom modification in player
* revert interval
Co-authored-by: Ginger Wong <omqmail@gmail.com>
