Function clamp

clamp(bipolarValue: number): number
Clamp a bipolar value
```
import { Bipolar } from 'https://unpkg.com/ixfx/dist/data.js';
Bipolar.clamp(-1);   // -1
Bipolar.clamp(-1.1); // -1
```
Throws an error if bipolarValue is not a number or NaN.
Parameters
- bipolarValue: number
  Value to clamp
Returns number
Clamped value on -1..1 scale