Improve AttachentList

The attachmentList widget is used in several places (contacts, meetings, in editing profile for friends and communities), etc

The existing code tries to access the thing linked and make up a goof label for it. That works well sometimes, sometimes it fails (because of CORS etc). Te abiliy of the user to be able add an rdfs:label in the data would solve that problem.

Also may add a little comment on the link. "i found this invaluable" etc.

(In a separate issue, allow pressing on the target on mobile to copy from clipboard, for when you can't drag and drop)

also maybe add this to the foms

Inizia individuando il widget attachmentList in TypeScript e i suoi utilizzi in contacts, meetings, profile editing e forms. Leggi come vengono attualmente ricavate le label, quindi chiarisci il comportamento previsto per i valori rdfs:label forniti dall’utente e per i commenti facoltativi dei link; la richiesta relativa al mobile clipboard è esplicitamente separata. Il lavoro è completato quando il comportamento concordato per label e commenti funziona in modo coerente negli utilizzi previsti.