1. removed audio_thread.c and audio_thread.h
** main.c
2. removed #include "audio_thread.h"
3. removed audio_thread_env audio_env declaration
4. removed audio_env.quit = 1 from signal handler
5. removed pthread_t audioThread variable, audioThreadReturn variable, AUDIOTHREADATTRSCREATED, AUDIOTHREADCREATED
6. removed launch_pthread for audio thread
7. removed pthread_join for audio thread
8. removed audio_env.quit = 1 from error handline of video and osd launch_pthread calls
