code: function distanceAAShapes(shapeA, shapeB) {
      const dx = Math.max(Math.abs(shapeA.pos.x - shapeB.pos.x) - ((shapeA.w / 2) + (shapeB.w / 2)), 0);
      const dy = Math.max(Math.abs(shapeA.pos.y - shapeB.pos.y) - ((shapeA.h / 2) + (shapeB.h / 2)), 0);
      return Math.sqrt(dx * dx + dy * dy);
  }
docs: AA = Axis Aligned, distance from AA shape to AA shape
  @param {{ pos: Point2D, w, h }} shapeA AA shape A
  @param {{ pos: Point2D, w, h }} shapeB AA shape B