So I tried doing this "the old way" by calculating the angle between the center
line and the tangent and then rotating and translating - but that got too messy
too fast for my second test case, and the first one was hairy enough.

So I implemented a fully analytical method to calculate the endpoints of the
tangent lines "in place" for any arbitrary set of circles.

Input for the macro is just a list of circle centers and radii.

Now to implement some further logic, and then try non-circular "pulleys", and
linear bends.

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