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I wanted to create this on the branch that I have requested to merge but looks like I can't really do that as that branch does not exist in this repo. (Sigh: github should really allow for creating PRs over other PRs :P)
Anyway, this is a simplification of pulling out the undo and redo functionality into the editor struct whilst also simplifying it a bit.
NOTE TO Reviewers: #128 does most of the work on which this build on. Only take a look at the last commit in this PR