refactoring of messaging controller with new model
MessagesVC is now implemented using the new LRC model for
conversations.
- Both views to display the messages (in call and off call)
initialize their MessagesVC with the current conversation when
needed.
- A conversation caching system is introduced to not get the whole
conversation::Info structure from LRC at each display request (once
per message).
Change-Id: Ib520c1f88be78de37968d3d7741010f2c73f20ea
Reviewed-by:
Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
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