Convert the libqb audio logging to use the new logging system

[mkilgore]

#566 converted the image logging to use the new logging system but did not touch the audio system. The conversion process for audio will be the same as it was for image:

1. In audio.h, write new audio_log_* macros that call libqb_log_with_scope_* with the logscope::Audio (the scope already exists).
2. Replace all AUDIO_DEBUG_PRINT usages with a corresponding audio_log_*. The log level to use depends on the statement (Ex. How often it will appear, how useful it is to see, etc.)