ref #7887 Use DTOs in term editor
ref #6913 Remove polytomous handler
ref #6913 Remove graph key editor
ref #6925 Open "editors" in editor area
ref #7038 Set part title for key
ref #6908 Migrate remaining polytomous context menus and handlers
ref #6908 Migrate polytomous key list and graph editor
ref #6908 Migrate polytomous key list editor