Add module that uses arrays instead of lists

[pbiggar]

Defining HTML elements using lists is very verbose, since rescript makes us write list{} instead of []. Maybe we should add a module to Html or Html.Attrs which uses arrays instead. Presumably, we would require the user to provide only immutable arrays (or they'd have bugs).

[pbiggar]

Maybe let's do this in a future release.

[pbiggar]

I've come to think that all uses of lists in the vdom interface should be replaced by arrays.

[YoelisA]

Hi, I came here to suggest that :) If you can point me in the right direction I'd be happy to submit a PR !
Thank you for this great piece of work !

[pbiggar]

@YoelisA thanks! If you change the signature of Vdom.node to use arrays, I think everything else will follow from that.