audio: cleanup audio source/sink with virtual inheritance
The audio implementations now inherit from sync block (as they used to).And the redundant constructor in audio source/sink has been removed.
audio: fixing class typo for OSX audio driver.
audio: re-adding circular_buffer.h for OSX build.
audio: moved audio docs to gr-audio and fix comments
gr-audio: added README and default config fix
audio: high prio for platform specific audio osx
audio: added windows and osx audio source files
audio: added config checks for other audios, added jack and port
audio: make prefs look like old audio, removed old audio.py
audio: register arches with priorities, ex: prefer alsa over oss
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