avatars: add fallback avatar image
- Draws a generic person overlay in the case of a ringId being the
only available name.
- Sets the conversation's username to the contact's ringId at
initialization, if no registered name is available.
- Sets the presence at conversation initialization.
Change-Id: I1874b57719398acd6aa096b645f540ce3a528cf0
Reviewed-by:
Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>
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