* 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
(This is becuse they might have been deleted in a delete operation
and we are immediately redrawing the results of that operation before
reselecting something else)
(closes#3455)
Also fixed a minor bug in `iD.uiCmd` that was causing keyboard shortcuts
like '⌘⌫' to convert to 'Ctrl+Backspace+' (note extra trailing '+')
It affected only the tooltip display, not the key event binding.