Use Select2 picker in recipient fields

Description

New Select2 picker should be used to pick users and email addresses and other recipients.
This will display more information (e.g. user full name) of the selected recipients.

Environment

None

Preliminary Test Cases

None

Assignee

Tibor Hegyi

Reporter

Tibor Hegyi

Labels

None

Access to limited visibility issues

None

Product platform

None

Module Dependency

None

Ready for Development

None

Fix versions

Priority

Blocker
Configure