Move avatar handling from Empathy to libfolks
@pwithnall
Submitted by Philip Withnall Link to original bug (#627401)
Description
As much of the avatar handling machinery in Empathy as possible should be moved to libfolks. For example, a desktop-wide cache of Personas' avatars should be used instead of a cache specific to Empathy.
Hopefully, EmpathyAvatar can be destroyed as a result of this.
Version: 3.1.x