Changes:
* Private constructor for case class means private apply in Scala 3
* Logger class with Any instead of wildcard where needed
* Explicit import of internal implicit conversion import SinkToCompletionStage
* Hopefully source and binary compatible Scala 3 signature for GraphApply.create methods
* ZipLatestWith leaking private type
* Auto apply-to-lambda made explicit
* Internal async callback event class covariant
* Hub leaking private type
* Remove cycles in stream Buffer classes
* Avoid cyclic import in ResizableMultiReaderRingBuffer
* Safe cast of Subscribers
* Explicit import of internal implicit conversion SourceToCompletionStage
* Ambigous field name and method
* recover delegates using PF from javadsl not inferred, made explicit
* TcpStage completing promise with wrong type
* Collect aggregator empty value cannot be underscore with type ascription
* Some type alias shenanigans in QueueSink removed
* Explicit type on effectiveMaximumBurst in Throttle
* Override method return type not inferred in GraphInterpreter
* MutableCollectorState.accumulated getter got wrong type somehow
* TLS actor fallback case only applicable to null
* Some internal unchecked pattern matching removed
* Ok that createGraph is not present in Java API
* Separate impl per language for implicit actor system apply
* Add scalafix plugin for jdk 9.
* Add command alias sortImports.
* Excludes some sources from SortImports.
* Update SortImports to 0.4.0
* Sort imports with `sortImports` command.
* ⇒, →, ←
* because we don't want to show them in documentation snippets and
then it's complicated to avoid that when snippets are
located in src/test/scala in individual modules
* dont replace object `→` in FSM.scala and PersistentFSM.scala
* Add CopyrightHeader support for sbt-boilerplate plugin.
* Add CopyrightHeader support for `*.proto` files.
* Add regex match for both `–` and `-` for CopyrightHeader.
* Add CopyrightHeader support for sbt build files.
* Update copyright from 2018 to 2019.
* automatic throttle burst size, #24699
* throttleEven used maxBurst=Int.MaxValue, which in practise resulted
in no throttling at all at high rates
* The original problem that throttleEven tried to solve was that when
the throttle rate (cost / per) was high the cost of scheduling
dominated and became much lower than the given rate, if 0 or low
maxBurst was given. Difficult for user to know what maxBurst to use.
* In fact, that was already the case for rates > 30/s.
* This is fixed by automatically adjusting the maxBurst for higher
throttle rates in a new throttle overload that doesn't include
maxBurst parameter
* Also skipped the mode parameter for that variant since Shaping is
what almost always is what you want, and otherwise you can use
the full signature with a good maxBurst
* Deprecated throttleEven, since it is the same. Also fixed the
implementation of throttleEven to use the automatic burst size,
since Int.MaxValue is not useful at all.
* +str Add throttle combinator without bucket size in parameters
* Add mima filter plus comment formatting
* Reviwed throttle messages across all classes
* move mima filter to 2.4.6
* change to throttleEven, plus grammar fixes
* fix formatting
* changed mima filter according to new API
* fixes accoring to feedback
* #22506 Mark materializer extension as @InternalApi
* #22506 Added missing annotations on internal apis in the fusing package
* #22506 Missing annotations in io package
* #22506 Add internal api annotations in impl package
* #22563 more hiding of the classes in the impl package
* #22563 Formatting fixes
* #22506 Fix private access in stream tcl tests
