client: Clean up implementation of Pause action and fix double wait

• js/src/main/scala/cs214/webapp/client/StateMachineClientApp.scala:
  (processing): New Boolean indicating that an event loop is running.
  (timeout, setCooldown, tryProcessNextAction): Remove.
  (processActions): New function: start an event loop, setting processing to true while traversing actionsQueue. Recurse through a future to allow individual actions to delay the next iteration of the event loop.
  (processAction): Return a Future to let individual actions handle timeouts.
  (after): New function: Expose setTimeout as a Future.

Reported-by: Simon Lefort androz2091@gmail.com

requested review from @lewolff

assigned to @korban

approved this merge request

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• 3e0dd930 - client: Clean up implementation of Pause action and fix double wait

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changed title from Clean up Pause action implementation and fix double wait to client: Clean up implementation of Pause action and fix double wait

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