Add CDDA demuxer

OMXPlayer use DVDFactoryDemuxer for every media. With new CDDA demuxer RPi xbmc plays audio CDs.
The patch allows OMXPlayer, DVDPlayer and PAPlayer to use the same demuxer to play CDDA.

PAPlayer plays CD audio using dvdplayer demuxer
Merge branch 'RPi_CDDA' of https://github.com/hmis/xbmc into RPi_CDDA

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