### Tasks
- [x] New Editor behind a setting
- [ ] Ability to edit cells on the right hand side
- [ ] Ability to edit outputs/metadata on the right hand side (ensure metadata changes are validated, as valid JSON before saving)
- [x] Ability to revert input, metadata and output
- [x] Address issue with not being able to open editor more than once
- [ ] Toggle between rich and plain text outputs
- [ ] View white space differences in cells
- [x] Collapse unchanged cells (perhaps we can display them and just collapse by default, instead of hiding them?)
- [x] Navigation icons in editor toolbar to navigate to next/previous changed cell
- [x] Menu to show/hide metadata/output differences
- [ ] Breadcrumbs in new Editor (for some reason its not displayed)
- [x] Possibly display all output/metadata and suffix with (changed) and expand changed items by default (instead of hiding them)
- [ ] Change progress lable from `No Changed Files` to something else (e.g. `Computing Notebook Diffs`)