Function quantiseEvery

quantiseEvery(v: number, every: number, middleRoundsUp?: boolean): number
Rounds v by every. Middle values are rounded up by default.
```
quantiseEvery(11, 10);  // 10
quantiseEvery(25, 10);  // 30
quantiseEvery(0, 10);   // 0
quantiseEvery(4, 10);   // 0
quantiseEvery(100, 10); // 100
```
Also works with decimals
```
quantiseEvery(1.123, 0.1); // 1.1
quantiseEvery(1.21, 0.1);  // 1.2
```
Parameters
- v: number
  Value to quantise
- every: number
  Number to quantise to
- middleRoundsUp: boolean = true
  If true (default), the exact middle rounds up to next step.
Returns number