Changes

ALHelpers.getALFormat(..): Drop alGetEnumValue("type") and use 'type' via ALExtConstants directly: Fixes failing al.alGetEnumValue("AL_FORMAT_STEREO_DOUBLE")

al.alGetEnumValue("AL_FORMAT_STEREO_DOUBLE") failed w/ OpenAL-Soft,
despite having AL_EXT_MCFORMATS, AL_EXT_FLOAT32 and AL_EXT_DOUBLE supported.

Notable, al.alGetEnumValue("AL_FORMAT_MONO_FLOAT32") did work.

Fix ALAudioSink.dequeueBuffer(): AL_BUFFERS_PROCESSED result is total not accumulative while waiting (not yet dequeueing), ...

Further:
- brackets were missed in 'sleep =', i.e.
  'releaseBufferLimes-releasedBuffers * avgBufferDura' -> '(releaseBufferLimes-releasedBuffers) * avgBufferDura)'

- The minimum sleep of avgFrameDuration 'sleep = Math.max(avgFrameDuration, ..'
  lead to cut-off smaller sleep cycles and the else branch would only sleep for less (1ms) multiple times.
  Hence use the minimum of 2ms, where we subtract 1ms for busy polling.

  Notable, this is an extreme situation of small buffer sizes (duration),
  but may happen on like synthesizer applications (jsyn).

We actually could use latency (refresh cycle) as used in OpenAL-Soft,
but this is an undocumented feature .. sort of.