Display presence text with time of last seen.
Regroup text format into PresenceLevel.qml
Set publish expires to 2minutes in order to be more correct.
Update SDK for the last seen callback of presence model.
# Conflicts:
# linphone-app/assets/languages/ja.ts
Use models as it is from QML and avoid to use data translations (using address to get chat room replaced by using directly the chat room)
Use SDK chat room handlers on ChatRooms instead of general Core Handlers
Use a timeline as a proxy of chat rooms
Move events managments like unread messages or missed call to chat rooms
Add Chat rooms list and proxy, Participants
Add prototype for managing secure chat room
Add secure group chats feature
Convert some deprecated functions
Fix contacts display name and allow to show a subject instead of an address
Qt bug workaround : remove annoying warnings on Qt 5.15.1 and later
Fix secure group chat creation by adding the conference factory address to linphonerc and to the settings panel
