lacrosse_goal_circle function

The goal circle is a circular feature on the field that houses the goal line (see lacrosse_goal_line()) and the goal. Notably, for fields with a surrounding arc and/or fan around the goal area, this feature onlycircumscribes the goal. Those features will be handled separately. This feature may either be the full circle (e.g. all 360 degrees), or a partial circle that may be greater than a half-circle