A more compact way to browse through Func args, output values (tuples), and update definitions

Instead of the current filesystem-like tree, consider using something similar to a frame scrubber.

examples:
http://developer.download.nvidia.com/assets/cuda/images/toolsscreenshots/nsight_profiler.png
https://github.com/mikesart/gpuvis
http://richg42.blogspot.com/2015/02/a-telemetry-style-visualization-of.html
https://www.youtube.com/watch?v=UzEP4Q8MV3k