TODO List - by Priority
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* make sure Update not called from unsafe section (inside machine)

* add transition guards
  adds some complication (not much?)
  can you then have multiple transitions per event?  I say NO.
  needed?
  
* Add history?  Shallow?  Deep?

* add C-style comment support?

* change to using text templates for text output???

* document language

* document behavior (such as Transition always causing an exit+entry sequence)