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Use a Squircle Signed Distance Field based algorithm to do a very fast approximation of rrect blurs. This PR is to provide reference within the team to discuss the future of the algorithm compared to the Gaussian approximation functions that are currently in use. It isn't a complete solution, but can be completed easily with a little more work. Notably, it doesn't handle elliptical round rects, only circular corners. Could stand to include an attribution to the source (https://raphlinus.github.io/graphics/2020/04/21/blurred-rounded-rects.html)