Asynchronous game of "guess a number" - Part 2 (Concurrent programming in the Chemical Machine)

This tutorial is a continuation of the previous one, devoted to illustrating Chemical Machine programming using the example of "asynchronous guess-a-number game". In this game, the player can ask questions and the machine will answer all questions asynchronously, out-of-order. However, the machine should not print any answers while the player is typing a next question.

I show that the code in the previous tutorial has a deficiency: threads can be starved if the player sends too many questions quickly enough. I show how to reason about this problem in the chemical machine paradigm, and how to improve the previous solution. The new code is not longer than the previous one; the main difference is to create a separate reaction site for reactions that may take a long time.

Sample code in this tutorial:
https://github.com/Chymyst/Chymyst/blob/master/src/test/scala/io/chymyst/lab/ChymystGuessGame.scala

Main repository for the `Chymyst` library: https://github.com/Chymyst/chymyst-core/