Rewrite the Progress, Usage, Stepdefs formatters to the new formatter api #859
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Since these formatters are related through inheritance they are modified together. Since the Stepdef formatter neither defined any method of the old formatter api, nor defines any methods of the new formatter api, it is updated to the new formatter api by the changes in the Progress and Usage formatters.
Also some deficiencies of the Progress formatter are fixed, both that outline steps were printed as skipped (fixes #316), and some cases where the printed progress characters did not match the step count in the summary (here only 8 '-' were printed, but the step count says 11 skipped).
Related to #839.