Fix line shader to avoid artifacts on straight lines #421
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Closes #419
Changes how the 5th vertex position is calculated, avoiding the generate case when the current point is exactly on the line between the two neighboring points (i.e. the line is straight). Also fixes the calculation of the angle so it can actually be used to decide on what side the "inside" is.
I visually confirmed that the line examples still produce correct results, and that the artifacts in #419 are gone.