* doc clarifications
* examples compile with c99 not c11
* fix pulseaudio on_backend_disconnected not firing only during
flush events
* make wait events more efficient
* fix alsa devices race condition
* fix backend disconnected code handling
* add overflow test
* fix on_events_signal not called at correct times
* refactor pulseaudio device scanning
* fix SoundIoErrorNoSuchDevice string value