Add method to clean up (e.g. unsubscribe from events)

[Glavin001]

Why?

So this can be destroyed and cleaned up correctly.

Solution

Unsubscribe these events and potentially others:

manipulator3d/src/Manipulator3D.js

Lines 72 to 107 in 01ff7a1

	canvas.addEventListener( 'click', e=>{
	if( stopClick ){
	e.stopImmediatePropagation();
	stopClick = false;
	}
	});
	canvas.addEventListener( 'pointermove', e=>{
	this.update();
	this._updateRaycaster( e );
	if( !this.data.isDragging ){
	this.data.onRayHover( this._ray );
	}else{
	this.data.onRayMove( this._ray );
	canvas.setPointerCapture( e.pointerId ); // Keep receiving events
	e.preventDefault();
	e.stopPropagation();
	}
	});
	canvas.addEventListener( 'pointerdown', e=>{
	this._updateRaycaster( e );
	if( this.data.onRayDown( this._ray ) ){
	e.preventDefault();
	e.stopPropagation();
	stopClick = true;
	}
	} );
	canvas.addEventListener( 'pointerup', e=>{
	if( this.data.isDragging ){
	this.data.stopDrag();
	canvas.releasePointerCapture( e.pointerId );
	}
	});

[Glavin001]

Fixed with #7

[sketchpunk]

changes related applied to v0.0.0.6 and live on npm.

[Glavin001]

Fixed with f84f377