New field for author ID or URL

[DwMpdl]

Background

Sometimes non-human authors occur, like a project team, a ship crew etc.
In those cases, there is normally no ORCID available, but sometimes an other identifier or a website.

New feature

Make further field for authors beside the already existing fields "Name" and "ORCID".
The name of the field could be something like "ID/URL".
The ?-hint could be something like "ID of the author or URL to webpage with further information about the author"
The type of the field: string