Draft: chromecast fixes and subtitles support
Mostly just rebased the chromecast subtitles branch + a couple of fixes to make chromecast work in master.
Not sure if I can follow up this very much, it was just a quick (frantic) hack so we could watch a movie with subtitles. But this way people at least can avoid redoing the rebase etc.
Edited by Rémi Denis-Courmont