Split off last bot modules

And dissolve AI namespace.
There would have been so little left in Common.AI,
that keeping it made no sense anymore.

OpenRA.Mods.Common/Traits/Player/DummyBot.cs

@@ -0,0 +1,55 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("A placeholder bot that doesn't do anything.")]
+	public sealed class DummyBotInfo : ITraitInfo, IBotInfo
+	{
+		[Desc("Human-readable name this bot uses.")]
+		public readonly string Name = "Unnamed Bot";
+
+		[FieldLoader.Require]
+		[Desc("Internal id for this bot.")]
+		public readonly string Type = null;
+
+		string IBotInfo.Type { get { return Type; } }
+
+		string IBotInfo.Name { get { return Name; } }
+
+		public object Create(ActorInitializer init) { return new DummyBot(this); }
+	}
+
+	public sealed class DummyBot : IBot
+	{
+		readonly DummyBotInfo info;
+		public bool IsEnabled { get; private set; }
+		Player player;
+
+		public DummyBot(DummyBotInfo info)
+		{
+			this.info = info;
+		}
+
+		void IBot.Activate(Player p)
+		{
+			IsEnabled = true;
+			player = p;
+		}
+
+		void IBot.QueueOrder(Order order) { }
+
+		IBotInfo IBot.Info { get { return info; } }
+		Player IBot.Player { get { return player; } }
+	}
+}