more refactoring for autoPlay.
shared video element didn't seem to be working, reverted that for now, but you can still auto play a player if it's within a click event.
added tests for p-js config.
Removed the auto play check after the config loads, in p-js it's too late then, we've already seen a poster screen.
If we want to load the config before we create the poster screen, we'd be able to use the auto play value.