= str - #15618 - Renames Flow and Duct 'tee' operation to 'broadcast'
= str - #15621 - Moving FlowMaterializer argument to the end of all Flow and Duct methods which uses it.
+hco various smaller cleanups and helper additions
+htp add first version of new marshalling infrastructure
!hco prepare for multipart body parser implementation

Breakingness stems from
- renaming `EnhancedString::getAsciiBytes` to `EnhancedString::asciiBytes`
- removal of `HttpForm` (for now)
- refactoring of `MultipartFormData`
=htp smaller improvements in the marshalling infrastructure
+htp add first version of new unmarshalling infrastructure, tests still missing
+htp add high-level unmarshalling API entry point, more tests
=hco,htp Upgrade to latest release-2.3-dev head
=hco Apply review feedback
=htp Add more multipart unmarshalling tests
=htp Apply remaining review feedback
Merge pull request #15554 from spray/w/un-marshalling

http: new (un)marshalling infrastructure
=str #15535 Fix NPE in ActorPublisher stop
Merge pull request #15639 from akka/wip-15535-npe-ActorPublisher-patriknw

=str #15535 Fix NPE in ActorPublisher stop
=pro bump stream and http version
Merge pull request #15650 from akka/wip-stream-version-patriknw

=pro bump stream and http version
=pro Add akka-http to the aggregate project

and fix 2.11 dependency
Merge pull request #15651 from akka/wip-http-build-patriknw

=pro Add akka-http to the aggregate project
=hco #15665 fix BoyerMoore for byte values > 0x7f

This also converts tests to run over a binary alphabet instead of over
plain alphanumeric chars.