This removes the "wait" concept and replaces it with an extra parameter
for the step() callback for the blocking mode, which can be blocking or
non-blocking.
This also implements the wake() callback for waking up from a blocking
step.
Device information retrieval is now implemented in terms of device
enumeration. Backends should now return any information that would have
been returned from `onContextGetDeviceInfo` straight from
`onContextEnumerateDevices` instead.
The callback passed into `ma_context_enumerate_devices()` would
previously return a boolean, with true telling miniaudio to continue
enumeration, and false to abort. This got a bit confusing to read at
times, so I've decided to make this more explicit.
The new return type is an enum called `ma_device_enumeration_result`.
Instead of returning true to continue enumeration, the new return value
is `MA_DEVICE_ENUMERATION_CONTINUE`. Similarly, instead of returning
false to abort enumeration, `MA_DEVICE_ENUMERATION_ABORT` should be
returned instead.
This also removes the `performanceProfile` config option from
`ma_device_config`. Increase the period size if you want to be more
conservative.
Backends that have their own notion of a "latency hint" or the like will
have those options exposed via a backend-specific configuration option.
David Reid