MathUtils.shiftLeft / shiftRight can replace with >> << operator

[deepkolos]

https://github.com/StrandedKitty/streets-gl/blob/dev/src/lib/math/MathUtils.ts#L155

[StrandedKitty]

It's not the same. Operators << and >> always output 32 bit integers, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Left_shift