Added better IP forwarding

You can now use BungeeCord after another BungeeCord
Pings also respect the IP forwarding
A new Tablist mode "PASSTHROUGH" has been implemented to pass the PlayerListItems through
Added getIp() to the pending Connection to get the real Player IP (even through BungeeCord after BungeeCord). This does not break any Plugins since the getAddress() also works but it can give back the wrong IP