Add quick settings widget panel

[zara3x]

This adds a quick settings panel (using ipython's widgets) to more easily tweak settings for iterative design:

PS. The cutn variable was hardcoded to 16 so I've added it as a parameter.

Not sure how merges work for Colab notebooks, so let me know what I can do to help ease the process 👍

[aletts]

This looks cool. The main consideration I have at this point is whether or not colab-convert can convert this .ipynb->.py->.ipynb without losing the data. @MSFTserver : You'll likely be interested in this to see if colab-convert can generally handle this stuff.