EMI: Initialize sync on declaration.
EMI: Add parentheses.
EMI: Fix formatting.
EMI: Explicitly initialize g_imuse/g_emisound to null.
EMI: Move handling of pooled sounds to EMISound.
EMI: Cache AIFF files.
EMI: Do not free sound tracks in the audio thread.
EMI: Do not stop the sound in SoundTrack's destructor since the handle may have been invalidated by derived classes.