adding new class for math operations

VectoCore/Utils/VectoMath.cs

+namespace TUGraz.VectoCore.Utils
+{
+	public class VectoMath
+	{
+		public static double Interpolate(double x1, double x2, double y1, double y2, double xint)
+		{
+			return (xint - x1)*(y2 - y1)/(x2 - x1) + y1;
+		}
+	}
+}
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