Examples: Implemented a statistics summary when fps is set

[frank-weindel]

When fps is set on a run of an Example Test, skipping the first 10 fps samples, every 30 fps samples print out a statistics summary of those samples.

Example:

---------------------------------
Average FPS: 27.25
Median FPS: 26
P01 FPS: 19
P05 FPS: 26
P25 FPS: 26
Std Dev FPS: 2.7798381247835278
Num samples: 100
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