** audio_thread.c
1. removed hBufEnc and hBufOut variable declarations
2. added FILE *outfile
3. replaced #define OUTPUT_BUFFER_ALLOCATED with OUTPUT_FILE_OPENED
4. changed sAttrs.mode to Sound_Mode_INPUT (from FULLDUPLEX)
5. removed hBufOut Buffer_create and replaced with fopen
6. added #define OUTFILE
7. removed "prime the pump" Sound_write calls (only needed on audio output to keep from having buffer underflow condition)
8. in while loop, replaced Sound_write and memcpy with fwrite
9. in cleanup, replaced Buffer_delete(hBufOut) with fclose
