work on junction nodes, event context
PExpr in guard expressions, and work on PExpr in actions, work on FileFsm example
fix errors in parse actions expressions
work on errors in action generation
parser errors and complete parsing detection, simplify actions analyse
error messages about unknown history, error in local transition traverse calc, fix file fsm test
fix final and initial traverse, expressions in actions support, send keyword and Event ctx
fix parsing during actions expressions