returns the convex hull of a set of points using Andrew's monotone chain algorithm see: http://geomalgorithms.com/a10-_hull-1.html#Monotone%20Chain
array of points
the convex hull as an array of points
tests if a point is Left|On|Right of an infinite line.
0 for P2 left of the line through P0 and P1 =0 for P2 on the line <0 for P2 right of the line
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returns the convex hull of a set of points using Andrew's monotone chain algorithm see: http://geomalgorithms.com/a10-_hull-1.html#Monotone%20Chain