Function subtract

Returns a Point with the x,y,z values of two points subtracted (a-b).

z parameter is used if present. Uses a default value of 0 for 'z' when subtracting a 2D point with a 3D one.

Examples:

subtract(ptA, ptB);
subtract(x1, y1, x2, y2);
subtract(ptA, x2, y2);
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