moved audio stats to own overlay; audio stats now reset when audiomixer is killed;

Issue 1: audio stats were crowded and hard to read.

Fix: audio stats have been moved to its own overlay and can be activated in Developer->Audio Debugging Toos->Audio Stats.  Also, the estimated latency for each step of the audio pipeline has been added to provide a quick estimate of the total latency when echoing server audio.

Test: ran interface and verified stats.


Issue 2: audio stats did not reset when audiomixer was killed.

Fix: audio stats are now reset when audiomixer is killed.

Test: ran interface, switched domains, and verified stats were reset.


Additional changes: some warnings were fixed: parseData() was renamed and some unused variables were removed.