Function radianArc

radianArc(start: number, end: number, clockwise?: boolean): number
Computes the angle arc between a start and end angle, given in radians. It properly accounts for the wrap-around values.
```
// Between 0-90deg in clockwise direction
radianArc(0, Math.PI/2, true); // Yields: 3Pi/2 (270 deg)

// In counter-clockwise direction
radianArc(0, Math.PI/2, false); // Yields: Math.PI/2 (90deg)
```
See degreeArc to operate in degrees.

Orientation of angles is as follows:
```
      90deg
      Pi/2
       |
Pi  ---+--- 0
180    |
      3PI/2
      270deg
```
Parameters
- start: number
  Start angle, in radians
- end: number
  End angle, in radians
- clockwise: boolean = true
  Calculate in clockwise direction (default: true)
Returns number
Angle of arc, in radians.