Make it possible to copy link from a field to an annotation

Some fields may contain links. Sometimes, such a link (also) belongs in another field, for example when a publisher is known to also be a book seller. The user can currently copy the link text and paste it into an annotation, but the hyperlink does not carry over.

Possible solutions:

- allow rich text input in annotations (probably creates more problems than it solves)
- listen for copy/paste events and use this to sideload the URL after the user has pasted the link text
- make formatted links draggable and listen for drop events in annotation editor fields