* 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.
* akka.actor.allow-java-serialization = off
* Moved primitive (Long, Int, String, ByteString) serializers
from akka-remote to akka-actor since they had no dependency
and are useful also in local systems, e.g. persistence.
* e.g. needed for persistence-tck
* less allow-java-serialization=on in tests
* CborSerializable in Jackson/test module for ease of use
* JavaSerializable for Java serialization in tests, already in akka-testkit,
but misconfigured
* Made tests pass
* allow-java-serialization=on in akka-persistence
* allow-java-serialization=on in classic remoting tests
* JavaSerializable and CborSerializable in other remoting tests
* Added serialization for
* Boolean
* java.util.concurrent.TimeoutException, AskTimeoutException
* support for testing serialization with the inmem journal
* utility to verifySerialization, in SerializationTestKit
* remove AccountExampleWithCommandHandlersInState becuase not possible to serialize State when it's not static
* Effect() is factory in EventSourcedBehavior class
* test the account examples
* SharedLeveldbJournal.configToEnableJavaSerializationForTest
* support for exceptions from remote deployed child actors
* fallback to akka.remote.serialization.ThrowableNotSerializableException
if exception is not serializable when wrapped in system messages from
remote deployed child actors and Status.Failure messages
* it's implemented in `WrappedPayloadSupport.payloadBuilder`
* update reference documentation
* serialize-messages=off in most places, separate ticket for
improving or removing that feature
* migration guide, including description of rolling update
* fix 2.13 compiler error
* minor review feedback
