This allows the label collision boxes for the vertices to update
during these modes. Otherwise the labels.js `isInterestingVertex()`
function doesn't consider them interesting enough to update.
(closes#4237)
New rules:
- Rotation available if at least 2 unique nodes in selectedIDs
- Reflection available if at least 3 unique nodes in selectedIDs
* Support move, rotate, reflect, delete post paste on multiselection
* Improve text and error msgs for singular vs multi selections
* Move `disabled` checks from actions to operations
* Reproject center of rotation (closes#3667)
* Cleanup tests
