When flattening all endpoint API methods into a single class, some
method names may clash, e.g. every API has a new() method. So we skip
them, they must be accessed via the API method. Warnings are emitted to
document skipped methods.
ApiFactory provides a get_api() method to generate API objects without
having to hard-code class names. All API and object classes are loaded
automatically.
Also, added proper accessors for attributes of object classes.
