actually working custom lint passes

OpenRA.Game/ObjectCreator.cs

@@ -82,7 +82,15 @@ namespace OpenRA
 				a[ i ] = args[ key ];
 			}
 			return ctor.Invoke( a );
-		}
+		}
+
+        public IEnumerable<Type> GetTypesImplementing<T>()
+        {
+            var it = typeof(T);
+            return ModAssemblies.Select( ma => ma.First ).Distinct()
+                .SelectMany(ma => ma.GetTypes()
+                .Where(t => t != it && it.IsAssignableFrom(t)));
+        }
 
 		[AttributeUsage( AttributeTargets.Parameter )]
 		public class ParamAttribute : Attribute