Add interactive Bezier toy #100
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This contains a prototype of Euler spiral based offset and flatten, and will become an interactive figure in the corresponding blog post.
WIP, points to pre-merge commit. Also put NONE back on the group.
Apply robustness logic borrowed from main Vello dev: switch to derivatives, tweak derivatives to be nonzero, etc. Also improve drawing of the Euler spiral in the 180 degree U-turn case; it was drawn as a single cubic segment which is fine for small angle deviations, but makes a colinear case. This drawing is very hacky but is sufficient for visual display.
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This contains a prototype of Euler spiral based offset and flatten, and will become an interactive figure in the corresponding blog post.