Related: #669

Currently impl_outer_origin requires the module's Origin types not to take a generic parameter of the configuration trait (notably unlike system::Origin<T: system::Trait>). impl_outer_origin and impl_outer_event macros, when listing their modules, should be able to optionally provide the <T: Trait> suffix to denote that the Origin/Event struct in their module requires the configuration trait as a generic param.

• Specify if generic in impl_outer_event also impl_outer_origin
• Allow for non-parameterised enum items