ofxiPhoneSoundStream rewrite to ofxiOSSoundStream

- rewrite + leak fixes.
- objc code has been separated from OF code so that SoundInputStream and SoundOutputStream can work in pure objc projects outside OF.
- audio can now play without interferring with mic input.
- when interferences like alarms or phone calls occur, streaming stops and starts up again once the interferences stops.
- updated audioInputExample to make full screen + touching the screen plays audio.