Exit code support for command-line responses
Commands should be able to define an exit code which is returned when FLOW3 exits.
[FEATURE] Exit code support for command-line responses
This adds a new property "exit code" to the command-line response.
Controllers may set this exit code to an integer value to signal
any errors to the calling user or application. The default exit code
This change set also uses the new feature in FLOW3's built-in commands.