Function lookAtScreenPoint

lookAtScreenPoint(
    object: Object3D,
    target: Vector2Like,
    camera: Camera,
    factor?: number,
): null | Vector3
Look at a 2D point in screen space
Parameters
- object: Object3D
  the object to look at the point
- target: Vector2Like
  the target point in 2D screen space XY e.g. from a mouse event
- camera: Camera
  the camera to use for the lookAt
- factor: number = 1
  the factor to multiply the distance from the camera to the object. Default is 1
Returns null | Vector3
the target point in world space
Example: Needle Engine Component
```
export class MyLookAtComponent extends Behaviour {      
  update() {     
    lookAtScreenPoint(this.gameObject, this.context.input.mousePosition, this.context.mainCamera);   
  }   
}   
```
Example: Look at from browser mouse move event
```
window.addEventListener("mousemove", (e) => {
  lookAtScreenPoint(object, new Vector2(e.clientX, e.clientY), camera);
 });
```