Fix EmptyBinder not identifying inheritance.

Assets/Cryville/Common/BinderAttribute.cs

@@ -33,12 +33,12 @@ namespace Cryville.Common {
 		public override object ChangeType(object value, Type type, CultureInfo culture) {
 			if (value == null)
 				return null;
-			else if (type == value.GetType())
+			else if (type.IsAssignableFrom(value.GetType()))
 				return value;
 			else if (type.IsEnum && value is string) {
 				return Enum.Parse(type, (string)value);
 			}
-			throw new InvalidCastException();
+			throw new InvalidCastException(string.Format("Cannot cast {0} to {1}", value.GetType(), type));
 		}
 		
 		public override void ReorderArgumentArray(ref object[] args, object state) {