String diff/patching

[mightyiam]

@eugeneware would you be happy if I introduced a PR with string diff/patching, using probably diff?

[eugeneware]

My preference would be to use something based on operational transforms if possible. Something like https://github.com/marcelklehr/diff_match_patch that is used by https://github.com/marcelklehr/changesets.

That way we would be able to be able to resolve concurrent changes.

But in any case, it should be an option that should be passed through like { stringDiff: true } or something like that. I wouldn't want it to be the default.