* Provide shorter aliases for the ActorRefProviders #20649
* Use the new actorefprovider aliases throughout code and docs
* Cleaner alias replacement logic
* because it is not referentially transparent; normally we reserved parens for
side-effecting code but given how people thoughtlessly close over it we revised
that that decision for sender
* caller can still omit parens
- Promise was completed twice erroneously
- Purged the trait Status from Transport, using failed futures instead
- using intercept instead of try ... catch in tests
- added termination hook for UntrustedSpec to shut down second system
- Fixed threading issues in ThrottlerTransportAdapter
- Removed nulls from exception constructors
- replaced Promise.successful(...).future with Future.successful
- Transports no longer uses raw ActorRefs as listeners but proper interfaces.
- Added managementCommand support to Transports
- Added support for dynamically loadable transport adapters
- Added throttler/failure injector transport adapter
- added actor based adapter support
- Changed configuration method of multiple transports - Fixed tests to work with the new remoting
- Asynchronous lockless remoting
- Pluggable transport drivers
- Multiple transport support
- Simplified lifecycle events
- Support for netty based TCP, SSL+TCP and UDP support
- Updated Akka protocol with soft-state connections and failure detection
- Refactored failure detectors (currently duplicated from cluster)
