volleyball_free_zone function

The free zone is similar to the basketball_court_apron() in that it is the area outside the court. It may be the same color as the interior of the court, but isn't necessarily. Unlike basketball_court_apron() however, the boundary line thickness doesn't matter since the lines are considered in-play and therefore are included in the court's length and width. This is not the same as the volleyball_court_apron(), as this is the entire area outside of the court's lines, while the court apron corresponds to a colored apron inside the free zone