Improve AccountStatusMessage synchronization
Problems
On current master:
- when you send a message, the message is marked as SENT as soon as one device got the messages
- state is not kept after a reboot
- if we say that a message is sent as soon as one other member get the message, this must take into account the fact that Jami is distributed and the contact may fetch the message from another device, so this information MUST be synced
- status wasn't designed for swarm until now