* minor fixes
* remove now superfluous buffer from MultipartUnmarshaller
* remove unused TokenSourceActor
* remove FIXME: add tests, see #16437
* removed unused param remoteAddress (comment: TODO: remove after #16168 is cleared)
* convert FIXME to TODO (#18709)
* reenable tests in {Request|Response}RendererSpec due to fixed#15981
* remove logging workaround in StreamTestDefaultMailbox due to fixed#15947
- this entails making Module.isSealed==true if attributes are set
- also removed Module.nest(), which implied fixing replaceShape to form
a CompositeModule where CopiedModule was used before (GraphModule and
TlsModule)
Any previous usage can be represented in this fashion while typically
saving one function allocation and also saving the function literal’s
syntax overhead (for the seed). Plus a new feature: the provided
iterator does not have to be infinite, limiting how far expand is
allowed to go.
main work by @drewhk with contributions from @2m and @rkuhn
This work uncovered many well-hidden bugs in existing Stages, in
particular StatefulStage. These were hidden by the behavior of
OneBoundedInterpreter that normally behaves more orderly than it
guarantees in general, especially with respect to the timeliness of
delivery of upstream termination signals; the bugs were then that
internal state was not flushed when onComplete arrived “too early”.
* add supervion for stages and built in ops run by interpreter
* add supervision for mapAsync and mapAsyncUnordered
* add supervision to groupBy and splitWhen
* reference doc for scala and java
