BD-J: Separate playlist player prefetch and start.
BD-J: Separate playlist player prefetch and start.

Fixes triggering playback status events too early.

mwgoldsmith/bluray,Azzuro/libbluray,Distrotech/libbluray,vlc-mirror/libbluray,Distrotech/libbluray,vlc-mirror/libbluray,ace20022/libbluray,EdwardNewK/libbluray,tourettes/libbluray,koying/libbluray,koying/libbluray,EdwardNewK/libbluray,koying/libbluray,ShiftMediaProject/libbluray,Azzuro/libbluray,Azzuro/libbluray,vlc-mirror/libbluray,ace20022/libbluray,mwgoldsmith/bluray,EdwardNewK/libbluray,mwgoldsmith/bluray,Azzuro/libbluray,ace20022/libbluray,koying/libbluray,EdwardNewK/libbluray,Distrotech/libbluray,ShiftMediaProject/libbluray,tourettes/libbluray,ace20022/libbluray,Distrotech/libbluray,ShiftMediaProject/libbluray,mwgoldsmith/bluray,tourettes/libbluray,vlc-mirror/libbluray,tourettes/libbluray,ShiftMediaProject/libbluray