1) If a message fails to be delivered, post a notification in the
status bar if that thread is not active and visible.
2) If a message fails to be delivered because there is no service,
keep retrying every time service becomes available again.
1) Refactor the master secret reset logic to properly interact with
services.
2) Add support for "BigText" and "Inbox" style notifications.
3) Decrypt message bodies when unlocked, display 'encrypted' when
locked.
