Function normaliseByRect

Normalises start and end points by given width and height. Useful for converting an absolutely-defined line to a relative one.

// Line 1,1 -> 10,10
const l = Lines.fromNumbers(1,1,10,10);
const ll = Lines.normaliseByRect(l, 10, 10);
// Yields: 0.1,0.1 -> 1,1
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