ESC-154 ESC-156 Data collection and control for viewer metrics

Detect QAMode (and new QAModeMetricsSubmode) settings which
enable logging of metrics report locally and a faster cycle
time to reduce test waiting.  Do this only in the main thread
and propagate the result via collector constructors (will
likely move that out and put it in llappviewer/lltexturefetch
which is more correct scope).  Managed to deadlock myself with
a recursive mutex (sheesh).

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