[Feature Request] public method to reset average FPS

[arvz]

Would be really nice to have the ability to reset the FPS average.

For example, I might be playing in scene that's really slow, which puts my average FPS at a low value, then move on to a different scene which I'm interested in performance-testing separately from that previous scene, but because the average FPS was already set to a low value due to the previous scene, this affects the average FPS of the new scene.