Imperative

• Enhancement: Add client-side custom-event handling capabilities. #2136
• Next-Breaking: Refactored the Imperative Event Emitter class. #2136
  • Removed the ImperativeEventEmitter class.
  • Added an EventProcessor class to handle event listening and emitting.
  • Added an EventOperator class to handle creation and deletion of EventProcessors.
  • Added an EventUtils class to contain all common utility methods for the Client Event Handling capabilities.
  • Added IEmitter, IWatcher, and IEmitterAndWatcher interfaces to expose what application developers should see.