make cloak palette configurable

OpenRA.Mods.RA/Cloak.cs

@@ -22,6 +22,7 @@ namespace OpenRA.Mods.RA
 		public int CloakDelay = 30; // Ticks
 		public string CloakSound = "subshow1.aud";
 		public string UncloakSound = "subshow1.aud";
+		public readonly string Palette = "shadow";
 
 		public object Create(ActorInitializer init) { return new Cloak(init.self, this); }
 	}
@@ -70,7 +71,7 @@ namespace OpenRA.Mods.RA
 				return rs;
 
 			if (Cloaked && IsVisible(self))
-				return rs.Select(a => a.WithPalette("shadow"));
+				return rs.Select(a => a.WithPalette(info.Palette));
 			else
 				return Nothing;
 		}