Contacts API missing details

[pschichtel]

The endpoint https://api.sipgate.com/v2/contacts's response does not include the note field, that can be set on contacts. The CSV export does contain the field. This field is important for additional machine readable metadata, that I want to attach to contacts.

[pschichtel]

It would also be great to see the separate fields for firstname, lastname and display name, currently there is only a name field. To retain backwards compatibility name could remain as-is (seems to be the display name) and firstName and lastName could be added.