conversation: remove connections to LocalService

All connections to the LocalService have been removed. Contact details
in the adapter are now loaded from the presenter using Glide.

loadContactData has been modified to handle both system and vcard
contacts. This will allow us to work only with byte arrays throughout
the app

Tuleap: #1368
Reviewed-by: Hadrien De Sousa <hadrien.desousa@savoirfairelinux.com>
Change-Id: I939df6002cc175d96b4886de510ade00ba8075a4