EDIT

ref #7195 consistently displaying blocking registrations in list view and registration working set editor:

• RegistrationWorkingSetService method to load blocking registrations
• using ShowDetailsEvent to request presenters to show blocking registrations...

ref #7195 showing blocking registrations in RegistrationWorkingsetEditor

no longer deleting registration when typedesignation editors are canceled

ref #6740 enabling typeName button in NameTypeDesignation editor and first changes to make delete working

ref #7195 creating blocking relations and showing 'em in the listView

new TaxonEditorMode: requireNomenclaturalReference

fitering TaxonEditorModes before passing to basionym editor

ref #7195 enabling and highlighting blockedBy button

ref #7195 introducing the concept of EditorActionContext stacks to facilitate creating blocking relations

fixing event scope problem