Within = function (a, b, tolerance)
{
    return (Math.abs(a - b) <= tolerance);
}
Checks if the two values are within the given `tolerance` of each other.

@function Phaser.Math.Within
@since 3.0.0

@param {number} a - The first value to use in the calculation.
@param {number} b - The second value to use in the calculation.
@param {number} tolerance - The tolerance. Anything equal to or less than this value is considered as being within range.

@return {boolean} Returns `true` if `a` is less than or equal to the tolerance of `b`.