This sends the set of peers in the game to all the peers in the game.
This is called automatically by the NetworkManager if one is active. It happens when clients connect to and disconnect from the server, and when players are added and removed from clients. The function SendPeers() udpates all clients with the information about which client owns which objects. It is automatically called when players are added and removed via the NetworkManager, but there is no hook in the NetworkManager when non-player client authority objects are added and removed. SendPeerInfo() is NOT called automatically. It is up to user code to call SendPeerInfo() when they want to update the set of client-owned objects.