Function calcDividedAngles

Calculate [bulletCount]-way angles

Example

// centerDeg:90, div:3, rangeDeg:60
const PI = Math.PI;
const angles = calcDividedAnglesFromRange(PI/2, 3, PI/3)
console.log(angles) // [PI/3, PI/2, PI*2/3] (= [60, 90, 120] in degree)