Function grid

grid(
    parent: SVGElement,
    center: Geometry.Point,
    spacing: number,
    width: number,
    height: number,
    opts?: LineDrawingOpts,
): SVGGElement
Creates a square grid based at a center point, with cells having spacing height and width.

It fits in as many cells as it can within width and height.

Returns a SVG group, consisting of horizontal and vertical lines
Parameters
- parent: SVGElement
  Parent element
- center: Geometry.Point
  Center point of grid
- spacing: number
  Width/height of cells
- width: number
  How wide grid should be
- height: number
  How high grid should be
- opts: LineDrawingOpts = {}
Returns SVGGElement