player: rework aout/vout callbacks
Document that vlc_player_t functions should not be called from these callbacks. A player function could trigger an action on the vout/aout and cause a callback to be called => deadlock. Remove the vlc_player_t * argument, it was never used. Add the audio_output_t *argument for aout callbacks. It's not currently used, it is added as symmetry with vout callbacks.
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