Added respawn ability in /reco

- Added a notification message when you die stating you can respawn with
/reco
- Added a respawn packet sent before disconnecting when using /reco

Note: Why a respawn in /reco and not a /respawn command?  Once respawned
using the console on 1.6.2 server, the player stays invisible for other
players unless he (or the other player) disconnects & reconnect so it's
necessary to reconnect after respawning.

MinecraftClient/McTcpClient.cs

@@ -194,6 +194,7 @@ namespace MinecraftClient
                 else if (text == "/reco" || text == "/reconnect")
                 {
                     ConsoleIO.WriteLine("You have left the server.");
+                    handler.SendRespawnPacket();
                     Program.Restart();
                 }
             }