Support functionality

• lists of boxes which are placed on one another vertically
  • used to find current load weight on each box
  • each point has a minimum, but maximum must be calculated
• what is the best way to determine which boxes are placed one another vertically
  • same z coordinate + intersects -> lists of sorted placements along z
• lists of boxes which are placed side by side horizontally
• what is the best way to determine which boxes are placed side by side horizontally
  • same x or y coordinates + intersects -> lists of sorted placements along x and y