Snake case and js_of_ocaml

[dbuenzli]

@cvine

The same solution works to escape property identifier names which are ocaml keywords, as in F##new_, whenReady##then_ and so on.

Another option, encouraged by brr’s identifier convention is to prime them, obj##new'. These final underscores always leave me wanting for more, they look like typos to me :–)

(Though that likely doesn’t work for that particular ppx)