audio: use audio_thread_priority instead of libc
#74
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The `self.output.write()` call blocks as long as it has to anyway, so lowering the message `recv()` timeout shouldn't churn the CPU _that_ much more. Benefit is that in low CPU time situations, we'll be less likely to have choppy audio.
We can get away with a lower buffer here, `25ms` should be enough. The benefit is that pausing (and implicitly `flush()`'ing) will only take `25ms`~ now instead of `50ms` which was noticeable.
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Cross-platform - works without permissions.
https://github.com/mozilla/audio_thread_priority