Geometry_Enigne: Full refactor of polyline offset

Facade_Engine/Modify/OffsetVariable.cs

@@ -38,12 +38,12 @@
         /**** Public Methods                            ****/
         /***************************************************/
 
         [Description("Creates an offset of a curve. Works only on planar curves")]
-        [Input("polyCurve", "Curve to offset")]
+        [Input("curve", "Curve to offset")]
         [Input("offsets", "Offset distances (Length must match count of curves in the PolyCurve). Positive value offsets outside of a curve. If normal is given then offsets to the right with normal pointing up and direction of a curve pointing forward")]
         [Input("normal", "Normal of a plane for offset operation, not needed for closed curves")]
         [Output("curve", "Resulting offset")]
         public static PolyCurve OffsetVariable(this PolyCurve curve, List<double> offsets, Vector normal = null, bool tangentExtensions = false, double tolerance = Tolerance.Distance)
         {
             //TODO:
             //Migrate to Geometry Engine and align with Offset method