+act #15804 blackbox verification for head subscriber
=str: #16285: Expand should not drop elements on completion
+htc fix Java build for Eclipse
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
!str #16166 upgrade stream TCP APIs to end-user style
!htc #16162 upgrade HTTP-level APIs to end-user style
!htp upgrade (and simplify) main API entrypoints
Merge pull request #16387 from drewhk/wip-16285-expand-fail-drewhk

=str: #16285: Expand should not drop elements on completion
Merge pull request #16404 from ktoso/str-verify-headsubscriber-ktoso

+str #15804 blackbox verification for head subscriber
=str apply review feedback
+htc add `startHandlingWith*` helper methods to `Http.ServerBinding` and `Http.IncomingConnection`
=str: #15802: TickSource cancellable

also, fixing intermediate materialization for Source.concat
!htp remove `ScalaRoutingDSL`
+htc add starting points for requests with a certain HTTP method
+htc add japi.MediaType.toContentType helper
!htc small fixes to the japi.Authorization/HttpCredentials model
+htc add missing HttpEncodings constants and related helpers
+htp add shortcuts for quick encoding / decoding
=pro simplify `akka.genjavadoc.enabled` option parsing