Allow TermNames to have signed names
Allow TermNames to have signed names

First step: Handle TermNames whose "name" component
(now called "designator" is a SignedName).

som-snytt/dotty,lampepfl/dotty,som-snytt/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,som-snytt/dotty,lampepfl/dotty,lampepfl/dotty,sjrd/dotty,dotty-staging/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,som-snytt/dotty,dotty-staging/dotty,som-snytt/dotty,dotty-staging/dotty,sjrd/dotty,sjrd/dotty