[AC-2658] iOS: Ti.Media.AudioPlayer can't play local audio files (using the url property)

Problem

Under iOS, trying to play a local audio file (the MP3 file exists in the Resources directory of the project) using Ti.Media.AudioPlayer fails with the following error message (popup dialog): {panel}{noformat}Unable to configure network read stream{noformat}{panel} and the song does not play. The same code works correctly on Android. Therefore, it is also a parity issue.

Testcase

{panel:title=app.js}

SoundtrackPlayer=Ti.Media.createAudioPlayer({
                   url:'APopularSong.mp3',
                   allowBackground:false
                 });
SoundtrackPlayer.start();

{panel}