[Feature] Live Modify

- [ ] Maybe have an 'experimental' option for this one?
- [ ] Document
- [ ] Confusing/unintuitive to use, need to think about pattern here
- [ ] Would be nice to click on element/hit-test
- [ ] Inconsistent display of bounding box when switching from highlight mode
- [ ] Inconsistent display of bounding box/interaction to click vs. caret in editor on element (when adorner shows or not i.e. have element in live property already and then modify vs. in modify and click on element in XML doc)
- [ ] More supported controls/options
- [ ] Adorner position incorrect
- [ ] Can't reselect an element after the adorner editor completes
- [ ] Document not marked as changed/dirty after updated by adorner editor