changed to 1 gameArray, from many array variables

[benjstorlie]

Now, instead of valuesArray and candidatesArray and colorsArray, there's just 1 gameArray

  /** @type {[Cell[][], React.Dispatch<React.SetStateAction<Cell[][]>>]} */
  const [gameArray , setGameArray] = useState(blankGameArray());

where blankGameArray gives a 9x9 matrix with Cell-type objects, like this

{
  value: 0,
  candidates: new Set([]), // empty set
  given: false,
  color: '',
}