#3 Missing current avatar of existing clients.

[Jeffrey J. Weston]

When a client connects to a world, the server informs
the client of what clients are connected, but not what
their current avatars are. This causes the new client
to render the avatar of all of the existing clients as
the default avatar, instead of whatever the users of
those clients have selected. The existing clients must
select a new avatar before the new client will be told
their current avatar. When a client connects to a
world, the server needs to inform it of the avatar of
all existing clients connected to the world.