Add ITargetableInfo interface for querying target types.

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -204,6 +204,11 @@ namespace OpenRA.Traits
 	}
 	public interface IBodyOrientationInfo {}
 
+	public interface ITargetableInfo
+	{
+		string[] GetTargetTypes();
+	}
+
 	public interface ITargetable
 	{
 		string[] TargetTypes { get; }

OpenRA.Mods.RA/TargetableBuilding.cs

@@ -15,10 +15,11 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	public class TargetableBuildingInfo : ITraitInfo, Requires<BuildingInfo>
+	public class TargetableBuildingInfo : ITraitInfo, ITargetableInfo, Requires<BuildingInfo>
 	{
 		public readonly string[] TargetTypes = { };
 
+		public string[] GetTargetTypes() { return TargetTypes; }
 		public object Create(ActorInitializer init) { return new TargetableBuilding(init.self, this); }
 	}
 

OpenRA.Mods.RA/TargetableUnit.cs

@@ -14,10 +14,11 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA
 {
-	public class TargetableUnitInfo : ITraitInfo
+	public class TargetableUnitInfo : ITraitInfo, ITargetableInfo
 	{
 		public readonly string[] TargetTypes = { };
 
+		public string[] GetTargetTypes() { return TargetTypes; }
 		public virtual object Create(ActorInitializer init) { return new TargetableUnit(init.self, this); }
 	}