Determine which side of the vector the point is on - to the right or to the left.

Example - if the vector is from bottom to top, then if the point is on the left, then it returns the value < 0, if the point is on the vector, then 0, if the point is on the right, then >0.

ac_request("geometry_calc_2d","where_C_leftorright",double X1, double Y1,double X2, double Y2, double pX, double pY, double dist);