Allow mods to display Encyclopedia production info.

OpenRA.Mods.Common/Traits/Encyclopedia.cs

@@ -28,6 +28,12 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Scale the actor preview.")]
 		public readonly float Scale = 1f;
 
+		[Desc("Ignore the Buildable trait when listing information.")]
+		public readonly bool HideBuildable = false;
+
+		[Desc("Specifies a production queue type if the actor can be built from multiple queues.")]
+		public readonly string BuildableQueue = null;
+
 		public override object Create(ActorInitializer init) { return Encyclopedia.Instance; }
 	}