Public issue https://github.com/mackron/miniaudio/issues/421

Public issue https://github.com/mackron/miniaudio/issues/420

Public issue https://github.com/mackron/miniaudio/issues/412

fix undefined behavior in ma_thread_wait__posix

Quoting man for pthread_detach:
> The behavior is undefined if the value specified by the thread argument
> to pthread_detach() does not refer to a joinable thread.

Since the thread was joined right before, pthread_detach should not be called.

Public issue https://github.com/mackron/miniaudio/issues/412

Update some outdated parts of the documentation

This time for example code showing 'ma_channel_converter_init' and
'ma_data_converter_init'.

'noPreZeroedOutputBuffer' was renamed to 'noPreSilencedOutputBuffer'
in v0.11.0.

This has been added for `ma_data_source` and `ma_sound`.

Public issue https://github.com/mackron/miniaudio/issues/411

Public issue https://github.com/mackron/miniaudio/issues/410

This allows the node graph to be connected to another node graph.

Public issue https://github.com/mackron/miniaudio/issues/410

Public issue https://github.com/mackron/miniaudio/issues/410

This bug results in an audio glitch when mixing nodes in the node
graph. It specifically happens when resampling is not being performed,
in which case it was specifying an output frame count greater than the
number of frames that are actually being output.

Public issue https://github.com/mackron/miniaudio/issues/408

Public issue https://github.com/mackron/miniaudio/issues/409

This commit removes the custom data loop and instead implements the
onDeviceRead and onDeviceWrite backend callbacks. This simplifies the
implementation and fixes a bug with duplex mode where the capture and
playback devices have different native sample rates.

This commit also fixes a bug with fixed sized callbacks with duplex
mode.

Public issue https://github.com/mackron/miniaudio/issues/397