Allow to add running call in conference.
Fix double participants on invitation while adding a new participant.
Fix "alone text" when the user is alone in conference.
Fix conference creation layout when switching of scheduled or not mode.
Fix led and start button behaviour while creating a new conference.
- Reload conference list when current account change.
- Fix popup design (margins).
- Factorization of message banner (eg. copy text message)
- Factorization of NewConference dialog.
- Fix design on file preview in chat.
- Add participant shortcut in video conference.
- Remove old Linphone-Utils file/scripts.
- Fix avatar image in history view when clicking on username.
