Consider not relying on constrained layout

[jklymak]

Overall this looks fun.

Super happy you are using constrained layout, but suggest you make it optional somehow. There are some times when it'll fail and users will want a way to turn it off.

I'm also not sure about initializing the figure inside of your helper, instead of letting the user pass it (optionally?).

[pganssle]

Agreed, honestly I kinda thought we already were taking the figure as input.

This issue is related to #47, since I'm not sure if all plotting libraries have the concept of a figure that can be passed in.