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Created a new audio player class, APlayer, from which we derive
 subclasses to encapsulate OpenSL ES AudioPlayer implementations:
 - ASfPlayer derives from APlayer and encapsulates StageFright
   functionality for audio decoding to a buffer
 - ADecoder derives from ASfPlayer and encapsulates rendering
   the decoded audio data to a callback function. It interfaces
   with the OpenSL ES Buffer Queue interface to pass the decoded
   data back to an OpenSL ES application.

For OpenSL ES, to support decoding to a Buffer Queue, we now
 allow an AudioPlayer to have its sink be a PCM buffer queue.

Change-Id: I9aefeb0375a71f7ca770c5c62b4fb8faf59c9c23