Convert cloneabletypes to bitsets

Fixes #15411

OpenRA.Mods.Cnc/Traits/Cloneable.cs

@@ -10,16 +10,20 @@
 #endregion
 
 using System.Collections.Generic;
+using OpenRA.Primitives;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.Cnc.Traits
 {
+	// Type tag for CloneableTypes
+	public class CloneableType { }
+
 	[Desc("Actors with the \"ClonesProducedUnits\" trait will produce a free duplicate of me.")]
 	public class CloneableInfo : TraitInfo<Cloneable>
 	{
 		[FieldLoader.Require]
 		[Desc("This unit's cloneable type is:")]
-		public readonly HashSet<string> Types = new HashSet<string>();
+		public readonly BitSet<CloneableType> Types = default(BitSet<CloneableType>);
 	}
 
 	public class Cloneable { }