Interpolate between two paths

[Wikunia]

Would be nice to have a way to convert from a circle to a square like described here:
https://www.youtube.com/watch?v=ABB1qqbesPM
and https://github.com/JuliaGraphics/Luxor.jl/blob/1cdcb74fdfffde264c3f8dfacb84a84e0085f154/docs/src/simplegraphics.md

but for every path to every other path such that
x^2 + y^2 = r^2

can be transformed into a circle somehow 😂
That might look ridiculous but there is only one way to figure it out.

Just some links:
How this can be done in d3.js:
https://github.com/veltman/flubber
https://www.youtube.com/watch?v=PLc1y-gim_0

[Wikunia]

This is probably out of scope in the beginning but maybe we can have a simple version which can transform one polygon to another. Thoughts @TheCedarPrince ?

[Wikunia]

Next up is: #80

[Wikunia]

We'll create smaller subissues like #80 from now on