Feature request: don't ever touch `innerHTML`

There's currently a very frustrating fundamental limitation in Scribe, which is that the "normalization" logic operates on raw HTML, rather then DOM nodes. This means plugins that get JavaScript references to DOM nodes end up becoming invalid because Scribe rewrites the DOM inside the editor and thus new nodes are created.

I'm currently having to do very hacky things like setting an id immediately before I know that the editor will be "normalized" and then getting a fresh DOM reference based off of the id. We've had to resort to hacks like this a few times already, and I'm trying to think of what a more compatible solution would be.