Function neighbours

Returns neighbours for a cell. If no directions are provided, it defaults to allDirections.

const grid = { rows: 5, cols: 5 };
const cell = { x:2, y:2 };

// Get n,ne,nw,e,s,se,sw and w neighbours
const n = Grids.neighbours(grid, cell, `wrap`);

Yields:
{
 n: {x: 2, y: 1}
 s: {x: 2, y: 3}
 ....
}
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Returns neighbours without diagonals (ie n, e, s, w):

const n = Grids.neighbours(grid, cell, `stop`, Grids.crossDirections);
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