Fix assign teams dropdown position.
Remove ICMP based pinger
Reimplement pinging via the orders channel.
Clean up lobby logic and visuals.
Remove obsolete Random Map button from d2k lobby.
Merge pull request #3158 from pchote/diy-pings

Rewrite ingame ping implementation.
save client IpAddress for later
display IP, ping, jitter in in-game stats GUI

closes #2281