Create Mods.Common

Create a small base for Mods.Common and update solution and makefile to use it

OpenRA.Mods.Common/ServerTraits/PlayerPinger.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using OpenRA.Server;
+using S = OpenRA.Server.Server;
+
+namespace OpenRA.Mods.Common.Server
+{
+	public class PlayerPinger : ServerTrait, ITick
+	{
+		int PingInterval = 5000; // Ping every 5 seconds
+
+		// TickTimeout is in microseconds
+		public int TickTimeout { get { return PingInterval * 100; } }
+
+		int lastPing = 0;
+		bool isInitialPing = true;
+		public void Tick(S server)
+		{
+			if ((Game.RunTime - lastPing > PingInterval) || isInitialPing)
+			{
+				isInitialPing = false;
+				lastPing = Game.RunTime;
+				foreach (var p in server.Conns)
+					server.SendOrderTo(p, "Ping", Game.RunTime.ToString());
+			}
+		}
+	}
+}