[Web] fix exit full screen issue

[ToddZeil]

#790
#688

When viewing full screen on web, returning from full screen causes original video to lose picture.
We re initialise controllers for web only when returning from full screen

Also refactor un needed set states, refactor play if finished( as video player restarts if finished)

[diegotori]

@ToddZeil thanks for your pending changes.

Definitely like the setState refactoring, since that will definitely go towards fixing this long term.

refactor play if finished( as video player restarts if finished)

This should actually be tied to ChewieController.looping, which calls out to VideoPlayerController.setLooping. In other words, it should only set the Duration back to zero if the underlying VideoPlayerController is currently looping.

Once that's done, then that should be good enough for me to approve and merge.

[ToddZeil]

@diegotori fair call, added those comments now

[ToddZeil]

@diegotori are you happy with the added comments ?

[diegotori]

LGTM.

Note that I'll merge and publish this tomorrow, since I don't have my development computer in front of me.