Added the option of firing triggers in a threadsafe manner on the state machine, enabling usage of SM as a shared resource between threads

[IvaTutis]

No description provided.

[IvaTutis]

This works brilliantly when using SM as eg. a singleton in a multithreaded app. I'm eager to hear your feedback.

[leeoades]

Hi @IvaTutis,
I can't see any unit tests. It would be well worth creating some that bombard the state machine with multiple threads in order to prove integrity.

[leeoades]

That said, I would not personally recommend this approach. Instead, I would wrap the state machine within a component that handles the thread-safety. There is no need to introduce such complexity into the state machine itself.

[crozone]

Please see discussion #527

We have not settled on a strategy, but we are more likely to eventually use a dedicated firing mode (FiringMode.Serial) that internally serializes triggers, rather than using dedicated method overloads.