Refactor Traits.fake into a Tags interface for primary production structures +mods

OpenRa.Game/Traits/Fake.cs

@@ -1,14 +1,16 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
 
 namespace OpenRa.Game.Traits
 {
-	class Fake
+	class Fake : ITags
 	{
-	
-	public Fake(Actor self){}
-	
+		public Fake(Actor self){}
+		
+		public IEnumerable<TagType> GetTags()
+		{
+			yield return TagType.Fake;
+		}
 	}
 }