Discretization using "CSMath.Geometry.CurveExtensions" regression

[Vilo176]

Hi friends,

Arc (and others) curved geometry discretization seams to have been screwed up recently.
Many entities use "CSMath.Geometry.CurveExtensions" to perform this task, and there is something weird in the code :

=> https://github.com/DomCR/CSUtilities/blob/644156d87b14d9f60916dd45a87a86cc36f6b07f/CSMath/Geometry/CurveExtensions.cs

Calculation of points is made in entity coordinates system :
startPoint is local X axis
prep is local Y axis

But the start angle is kept equal to Arc.StartAngle, leading to an angular offset in the result.

Solution :
Either keep Arc.StartAngle & Arc.StartAngle and calculate inside CSMath.XYZ.AxisX / CSMath.XYZ.AxisY coordinates.
Or set endAngle -= startAngle & startAngle = 0