#1939 Duplicate Call Detector Enhancements & Unit Tests #1980
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Closes #1939
Enhances thread safety in the duplicate call detector.
Adds unit testing to test for common scenarios.
Adds checks for encrypted audio to remove audio segments that initially have decoded audio and then get flagged as encrypted with an encryption key to protect against scenarios where a call is simulcast with one call encrypted and the other call unencrypted, to avoid flagging as duplicate the unencrypted call audio.