…wrapping streaming methods

…plied; import the correct user types packages when rendering service_interceptors.go; fix an ancient typo

…ce generation

…dpoint field from goa.InterceptorInfo struct since it is redundant with the next goa.Endpoint parameter sent to interceptors

…re defs

…thod with interceptors even if they do not apply

…ds with a CallType enum; organize interceptor wrappers file sections as types, functions, then methods

…ace to return a context itself

… info structs implement

…erver variations

…ithContext/ReceiveWithContext