Add RejectsOrders to disallow orders for offmap aircraft etc

OpenRA.Game/OpenRA.Game.csproj

@@ -170,6 +170,7 @@
     <Compile Include="Traits\EditorTilesetFilter.cs" />
     <Compile Include="Traits\Health.cs" />
     <Compile Include="Traits\LintAttributes.cs" />
+    <Compile Include="Traits\RejectsOrders.cs" />
     <Compile Include="Traits\Player\DeveloperMode.cs" />
     <Compile Include="Traits\Player\PlayerResources.cs" />
     <Compile Include="Traits\Render\RenderSimple.cs" />

OpenRA.Game/Traits/RejectsOrders.cs

@@ -0,0 +1,43 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2013 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.Linq;
+using OpenRA.Network;
+
+namespace OpenRA.Traits
+{
+	public class RejectsOrdersInfo : ITraitInfo
+	{
+		public readonly string[] Except = { };
+
+		public object Create(ActorInitializer init) { return new RejectsOrders(this); }
+	}
+
+	public class RejectsOrders
+	{
+		public string[] Except { get { return info.Except; } }
+
+		readonly RejectsOrdersInfo info;
+
+		public RejectsOrders(RejectsOrdersInfo info)
+		{
+			this.info = info;
+		}
+	}
+
+	public static class RejectsOrdersExts
+	{
+		public static bool AcceptsOrder(this Actor self, string orderString)
+		{
+			var r = self.TraitOrDefault<RejectsOrders>();
+			return r == null || r.Except.Contains(orderString);
+		}
+	}
+}

OpenRA.Game/Traits/ValidateOrder.cs

@@ -8,7 +8,6 @@
  */
 #endregion
 
-using System.Collections.Generic;
 using OpenRA.Network;
 
 namespace OpenRA.Traits
@@ -40,7 +39,7 @@ namespace OpenRA.Traits
 				return false;
 			}
 
-			return true;
+			return order.Subject.AcceptsOrder(order.OrderString);
 		}
 	}
 }