- rework the way social links are displayed/editted; we now only allow to
enter a so called "handle" and then substitute that in the final URL
template
- move the "icon" model role to NIM backend
This has several advantages:
- we display only the "handle" and don't have to elide some long URL
- we won't let users enter random URLs into their profile and spoof the
viewing part into clicking it
Additionally, make the social link "button" clickable -> navigate to the
target URL, and make the tooltip behave as "usual" (on mouse hover).
Note: interaction between clients is not tested here to avoid dependency
on mailserver. When mailserver is mocked more comprehensive tests should
be provided, that is: verify if identity properties are propagated
and read correctly between two different clients.
closes: #6950