Attaches the listener for the audio manager to this pawn. The listener will
track the pawn's position. Only the pawn associated with the local player will control the listener.
Note: If a pawn is a listener and plays a sound from itself, the sound will not be spatialized.
Note: In order to work properly the
PM_AudioListener mixin should used in conjunction with
PM_Player as well as PM_Spatial or one of its descendants.