* Audio: Stop setting capture config options.
Since the device is being configured as a playback device, all capture
config options are unused and therefore need to not be set.
* Audio: Stop pre-silencing the miniaudio output buffer.
raylib already manually silences the output buffer prior to mixing so
there is no reason to have miniaudio also do it. It can therefore be
disabled via the device config to make data processing slightly more
efficient.
* Audio: Stop forcing fixed sized processing callbacks.
There is no requirement for raylib to have guaranteed fixed sized
audio processing. By disabling it, audio processing can be made more
efficient by not having to run the data through an internal intermediary
buffer.
* Audio: Make the period size (latency) configurable.
The default period size is 10ms, but this is inappropriate for certain
platforms so it is useful to be able to allow those platforms to
configure the period size as required.
* Audio: Fix documentation for pan.
The pan if -1..1, not 0..1.
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