Frametime Graph

[MilchRatchet]

Once #69 is done, it would be nice to implement a frametime graph. A design that I liked quite a lot was the one used in the LegitEngine

There should ideally be two modes, one mode shows a rough division, i.e., a division into

Trace
Shade
UI

and a more fine division that shows the execution time of each kernel

...
Preprocess [Bounce 1]
Trace [Bounce 1]
...
GeometryHit [Bounce 1]
...
Trace [Bounce 2]
...