feat: Change dir to degrees

[Bubu-Droid]

Change the vector form of direction of points to degrees

[github-actions]

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[vEnhance]

I made a few formatting changes and also changed the code so that the angle measures are nonnegative (so between 0 and 360 rather than -180 and 180). Can you take a quick look and see that this looks OK?

[Bubu-Droid]

I compiled an asy diagram with the changes. It works as intended.