n-point random route

I'd rather just use radians for these functions, drop the conversions (`angleToDegreesFromRadians` isn't used anywhere, and `angleToRadiansFromDegrees` is only used for one log, and then internally in this function), and reduce this trig file to a single function: `internalAngleForPolygonOfNSides()` that implicitly uses radians (like all the math.h trig functions)