Format = function (string, values)
{
    return string.replace(/%([0-9]+)/g, function (s, n)
    {
        return values[Number(n) - 1];
    });
}
Takes a string and replaces instances of markers with values in the given array.
The markers take the form of `%1`, `%2`, etc. I.e.:

`Format("The %1 is worth %2 gold", [ 'Sword', 500 ])`

@function Phaser.Utils.String.Format
@since 3.0.0

@param {string} string - The string containing the replacement markers.
@param {array} values - An array containing values that will replace the markers. If no value exists an empty string is inserted instead.

@return {string} The string containing replaced values.