Incorrect validation in AttachmentCollection

[Noblebrown]

In AttachmentCollection.addItemAttachment(Class), a check is performed to see if the class is attachable. It checks to see if the class has any declared fields, which is incorrect as Class.getDecaredFields() will not return inherited fields and there are attachable classes that do not declare their own fields, but rely on those in parent classes. There is an @attachable annotation that is present on all attachable objects. It should be checking against this instead.