Convert masses of HashSet<string> to BitSet<DamageType>

OpenRA.Mods.Common/Traits/Buildings/Bridge.cs

@@ -47,7 +47,7 @@ namespace OpenRA.Mods.Common.Traits
 		public WeaponInfo DemolishWeaponInfo { get; private set; }
 
 		[Desc("Types of damage that this bridge causes to units over/in path of it while being destroyed/repaired. Leave empty for no damage types.")]
-		public readonly HashSet<string> DamageTypes = new HashSet<string>();
+		public readonly BitSet<DamageType> DamageTypes = default(BitSet<DamageType>);
 
 		public object Create(ActorInitializer init) { return new Bridge(init.Self, this); }