Some tidy ups in the file reader component
Added an opus port class to libtizonia
Added OMX.Aratelia.audio_decoder.opus and OMX.Aratelia.container_demuxer.ogg components to config files.
WIP: Initial work on the OMX.Aratelia.container_demuxer.ogg component
WIP: Initial work on the OMX.Aratelia.audio_decoder.opus component