Apply Scrolling Page Support

[davidbiga]

This adds an optional setter that allows you to add the scrolled y offset.
Use cases might entail if you have a component undeath a canvas that is rendered
that the user has to scroll to.

[davidbiga]

To give more context:

I have an interface that is part rendered via THREEjs and the other ReactJS. The problem I found was when the user scrolled down the page and hovered over the rendered model, there was an offset where the mouse was interpreted as being positioned at the top of the page. So what I did was create a scroll event listener and pass in the y offset as needed. Hence the new setter.

I would suppose others will find this helpful.

[Habacef]

I am using React and ThreeJS rendering together too. I see at multiple of my "react" interfaces that the meshes seem to think my mouse is "over" them. So I encorporated your code because I thought this may help. However it abolished all reaction and I couldn't get any object detected...