Release 4.0.0

• Minimum Java version now 11
• Issue #323 - WorkerPool and WorkProcessor have been removed, no more Disruptor::handleEventsWithWorkerPool
• Disruptor constructors using Executor have been removed. Use ThreadFactory instead.
• Rolled up event handling extension interfaces on to EventHandler:
  • BatchStartAware
  • LifecycleAware
  • SequenceReportingEventHandler
• FatalExceptionHandler and IgnoreExceptionHandler now use the JDK 9 Platform Logging API, i.e. System.Logger
• Add rewind batch feature to the BatchEventProcessor
• Add a maximum batch size argument to BatchEventProcessor
  • EventHandler::onBatchStart now gets both the batchSize as well as queueDepth (previously it had batchSize which reported queue depth)
• Added documentation to EventPoller
• Util::log2 throws if passed a non-positive argument
• Deprecations
  • Deprecated ThreadHints.onSpinWait()
  • Deprecated Disruptor.handleExceptionsWith() - this had been javadoc deprecated since 2015 but not in the code
  • Removed previously deprecated methods
    • Ringbuffer.resetTo()
    • ConsumerRepository.getLastSequenceInChain()