ExitCode is a value used in a call to panic to signify that code execution should be stopped,
before/after listeners executed and finally that the app whould exit with the provided exit code
type Step struct {
Do func()
Success *Step Error *Step Desc string Exiter func(code int)
}
Step is the building block of execution flow.
It has a code block to run, a success step to go to if the former succeeds, or go to an error step otherwise
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