Add startwithSAP/subsegmentstartswithSAP for aac, ac3, ec3 and ac4 audio tracks according to LIVE or VOD profile.
Replaces #1055
Partial solution for #364
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Co-authored-by: Xingzhao Yun <xyun@dolby.com>
Co-authored-by: Joey Parrish <joeyparrish@google.com>