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HexEditor: Implement undo and redo actions
This PR adds undo redo functionality to HexEditor and fixes the window being marked dirty even when no bytes are actually modified.
About time for HexEditor to get some more ❤️ 🎉 🎉 🎉 🎉 🎉
@djwisdom please tone down the excitment-posting on PRs a bit. :^)