Sets are now Copyable

src/builder/resources/speiger/assets/collections/templates/sets/AbstractSet.template

@@ -15,6 +15,8 @@ public abstract class ABSTRACT_SET KEY_GENERIC_TYPE extends ABSTRACT_COLLECTION
 {
 	@Override
 	public abstract ITERATOR KEY_GENERIC_TYPE iterator();
+	@Override
+	public ABSTRACT_SET KEY_GENERIC_TYPE copy() { throw new UnsupportedOperationException(); }
 	
 	@Override
 	public int hashCode() {