This bug is a result of the buffer of an AudioStream being smaller than
that of a period of the backend playback device. In this situation,
AudioStream's would have pauses between buffer updates because the
backend is not able to re-fill the AudioStream buffer's quick enough
due to it's periods being longer than the AudioStream buffer.

This commit should bring the mini_al backend up to feature parity with
the OpenAL backend.

Integrate Develop branch

Integrate Develop branch

Integrate Develop branch

To be more generic and configurable

...and reviewed some details