Prepare condition attributes for new lint rule.

OpenRA.Mods.Common/Traits/Pluggable.cs

@@ -20,10 +20,12 @@ namespace OpenRA.Mods.Common.Traits
 		public readonly CVec Offset = CVec.Zero;
 
 		[FieldLoader.Require]
-		[UpgradeGrantedReference]
 		[Desc("Conditions to grant for each accepted plug type.")]
 		public readonly Dictionary<string, string> Conditions = null;
 
+		[GrantedConditionReference]
+		public IEnumerable<string> LinterConditions { get { return Conditions.Values; } }
+
 		public object Create(ActorInitializer init) { return new Pluggable(init, this); }
 	}