This change makes sure that the userInfo entry for the "current user" is updated in lockstep with currentUserInfo when the user updates their avatar.
After this diff when a user updates their avatar
- The viewer's current session has their currentUserInfo and userInfos updated by updateUserAvatarActionTypes.success action payload
- The viewer's other sessions are updated via "broadcast"-ed UPDATE_USER and UPDATE_CURRENT_USER
- Non-viewer clients are updated via "broadcast"-ed UPDATE_USER
Depends on D7700