musicplayer: created a simple music player

Currently, this application just parses start and end time values
passed via command line options.

The intention is for this to be a functional music player using the
audio formats supported by Cainteoir Text-to-Speech that tests:

  *  audio output via speakers;
  *  SMIL time parsing (start/end times);
  *  audio format decoding, resampling and playback;
  *  audio extraction for a given time range (needed for e.g. SMIL).