adds a "is present" toggle to the user menu
Refactor user menu into own component
Add a config variable to determine if the user is allowed
to set themselve as present
- use always color black on projector, also in dark mode
- show border for projector preview
- Fix projector logo margin by using img instead of os-logo
- Use also 'username' in invitation email subject
* Add is_present field for csv import of users.
* Refactor JS functions get_full_name and get_short_name (Fixes#2136).
- Show participant number in get_full_name() output.
- Sort users by first or last name.
- Extend config option to sort users.
- Mark unused Python methods get_short_name and get_full_name.
