Formatters: allow steps.usage to select what to print #1090
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For testing of behave repository itself, it'd be useful to have formatters that would report just faulty steps. The steps.usage formatter now read 'steps.usage.classes' user config key and if it's content is comma-separated list of (used|unused|undefined). If it is not recognized this way, all the step classes are printed to maintain the present behaviour for user who could already depend on this very key.
Example usage:
$ behave --dry -f steps.usage -D steps.usage.classes=unused,undefined