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Audio output plugins can use this to expedite discarding pending
buffers. This reduces latency upon seeking or stopping the input.

This new callback also supports explicit draining, but this is not
used for the time being.

This prepares for a possible cleanup of the audio output object,
especially hiding more stuff into the core.

Also move some stuff from vlc_config.h to vlc_aout*.h

This is required for PulseAudio synchronization and to pause/resume
with low-latency. This should also be useful for other buffered
 audio outputs such as ALSA or CoreAudio.

Currently channels cannot be remapped and samples format must be S16N.