-str #16393 removes timerTransform from public API
=htc fix broken per-connection header cache
=htc replace `merge` + `zip` in server pipeline with new `FlexiMerge`
=htc small simplification in message parsers
+htc minor additions to header model
=htc #15799 add server-side 100-continue support, fix request- and entity-stream error propagation
=htc prevent response entity rendering for status codes not allowing response entities
Merge pull request #16397 from ktoso/str-remove-timer-transform-ktoso

-str #16393 removes timerTransform from public API
Merge pull request #16337 from spray/wip-15799-mathias

Add server-side support for `Expect: 100-continue`, other improvements
=str: #16345: fix IndexOOB, and error handling in the interpreter
Merge pull request #16398 from drewhk/wip-16345-interpreter-overflow-drewhk

=str: #16345: fix IndexOOB, and error handling in the interpreter
-str #16393 removes timerTransform mentions from scaladocs
Merge pull request #16411 from ktoso/fix-remaining-timerTransform-refs-ktoso

-str #16393 removes timerTransform mentions from scaladocs
=str: #16285: Expand should not drop elements on completion
+htc fix Java build for Eclipse
+str,htc #16071, #16072 New Stream Tcp and Http API

* StreamTcp and Http extensions now return Flows and Sources that can be materialized later
* Flow can now be completed with another flow to be turned into a runnable flow
Merge pull request #16383 from akka/wip-16071-16072-new-io-and-http-api-ban

+str,htc #16071, #16072 New Stream Tcp and Http API
Merge pull request #16417 from akka/wip-fix-eclipse-build

+htc fix Java build for Eclipse
=all some more fixes to make it build in Eclipse
Merge pull request #16387 from drewhk/wip-16285-expand-fail-drewhk

=str: #16285: Expand should not drop elements on completion