Add a CPU and GPU timer graph module

[Tayx94]

Look at FrameTimingManager:
https://forum.unity.com/threads/update-for-frame-timing-manager.1191877/

[paulatwarp]

If it helps, I have made this change on my fork. It uses FrameTimingManager to give separate cpu and gpu data. I've also changed the output to ms/f instead of fps as that tends to be more useful in practice. Also, I've got a statistical version of the 1% and .1% times.

It's not integrated as a separate module though, I just overwrote the original graph.