Hi yt-dev!

I just got through reviewing @neutrinoceros's work on refactoring how norms and colorbars are handled: https://github.com/yt-project/yt/pull/3849

A lot of effort went into it and it'd be great to get merged before it goes stale. Anyone want to give it a look? Even if you don't have the bandwidth to dig in too deeply, just checking out the branch and making some plots using the new functionality would be useful and appreciated!

If I don't hear any responses (and if there are no objections), I'm planning to go ahead and merge it next ~Tuesday -- if you **do** want to review the PR but won't have time before then, send me a note and I'll hold off and give more time for review.