add ISync to all traits that have [Sync] members

OpenRA.Mods.RA/Buildings/PowerManager.cs

@@ -17,9 +17,9 @@ namespace OpenRA.Mods.RA.Buildings
 	{
 		public readonly int AdviceInterval = 250;
 		public object Create(ActorInitializer init) { return new PowerManager(init, this); }
-	}
-
-	public class PowerManager : ITick
+	}
+
+	public class PowerManager : ITick, ISync
 	{
 		PowerManagerInfo Info;
 		Player Player;