Function FromMsOd

convert hit window timings into an Overall Difficulty (accuracy) value

if a hitwindow is missing, either replace it with NaN, null or undefined

Example

    const hitWindow_300s = 25.5;
    const hitWindow_100s = 67.5;
    const hitWindow_50s = 109.5;

    const first = FromMsOd(hitWindow_300s); // => 9
    const second = FromMsOd(NaN, hitWindow_100s); // => 9
    const third = FromMsOd(NaN, NaN, hitWindow_50s); // => 9
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