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This enables MML to determine if a unit has unsaved changes, offering us two features: First, tabs now show a little * next to the unit name if the tab has unsaved work, and second, we don't show the "would you like to save your work" safety prompt for units which don't have any work to save.
This PR also contains a very small extra feature, which allows you to middle click tabs to close them, which might cause merge conflicts if it was in a separate PR.