useFollowCam should optionalEl.addEventListener instead of always using document

[rob-myers]

Thanks for the great library!

When I run two Three.js scenes on the same page,
your <Ecctrl> reacts to events coming from the other scene.

This happens because you document.addEventListener in useFollowCam.tsx.

Could we optionally provide an alternative root element?

[ErdongChen-Andrew]

I think you could just disable the followCam: <Ecctrl disableFollowCam >

[rob-myers]

I think you could just disable the followCam: <Ecctrl disableFollowCam >

Sure that works, and since I intend to refactor your code to create my own controller this is not a real problem for me.

But if someone wants to use your library unmodified without writing their own camera, it would be nice to have the option.

Happy to make a PR, and even add some types.

[ErdongChen-Andrew]

Imo, disableFollowCam should be enough as an option. But if you have any better thoughts or ideas, you are more than welcome to share 👍