Function averager

averager(kind, opts): PointAverager
Uses Numbers.movingAverageLight to keep track of average x, y and z values.
```
// Create averager
const averager = Points.averager(`moving-average-light`);

// Call function with a point to add it to average
// and return the current average.
averager(somePoint); // Yields current average {x,y,z?}
```
Parameters
- kind: "moving-average-light"
- opts: Partial<{
  scaling: number;
  }>
  Scaling parameter. Higher means more smoothing, lower means less (minimum: 1). Default: 3
Returns PointAverager