AudioSelection: ensure to save subtitle configs
MovieList: add sanity check for root

Thanks Sjlouis for reporting
http://openpli.org/forums/topic/33733-crash-when-launching-movieplayer/page-2
Introduce different PIP types

Only when the box does support it
-standard picture over picture
-cascade picture next to picture
-splitscreen
-bigpip PIP is big so you see the PIP with main audio
-external PIP is not on the screen but on the external (SCART or so).

Thanks to Betacentauri
Changes in InfoBarGenerics to correctly switch new PIP modes

It could be that later I'll find a better way to work-a-round this
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2