Generates to a Struts ActionMapping object that delegates to an ActionMapping
in a different module. These are used for support of inheritance for simple
actions.
Note that there are some Controller attributes that are for actions such as
loginRequired and readOnly. This implementation extends GenSimpleActionModel
and overrides init() so that local Controller properties can be included in
the Struts module config we generate. Then the runtime can use these values to
override the values of the delegate.