Anonymous step funcs

[youtux]

Use _ as the step function name for all steps. It should not matter what the name is, and giving it a significant name was always a pain and useless.

This should also encourage users to not care about the step function name, but just the given/when/then names. Updated docs in #541 .

Inspired by the ward framework.

Checklist

• Merge Reusable step functions #534 first

[codecov]

Codecov Report

Merging #536 (d73fa1e) into master (adcc48f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #536   +/-   ##
=======================================
  Coverage   92.46%   92.46%           
=======================================
  Files          49       49           
  Lines        1685     1685           
  Branches      208      208           
=======================================
  Hits         1558     1558           
  Misses         90       90           
  Partials       37       37           

Impacted Files	Coverage Δ
pytest_bdd/steps.py	96.36% <ø> (ø)
tests/args/cfparse/test_args.py	100.00% <ø> (ø)
tests/args/parse/test_args.py	100.00% <ø> (ø)
tests/args/regex/test_args.py	100.00% <ø> (ø)
tests/feature/test_alias.py	100.00% <ø> (ø)
tests/feature/test_background.py	100.00% <ø> (ø)
tests/feature/test_cucumber_json.py	92.59% <ø> (ø)
tests/feature/test_description.py	100.00% <ø> (ø)
tests/feature/test_gherkin_terminal_reporter.py	100.00% <ø> (ø)
tests/feature/test_multiline.py	100.00% <ø> (ø)
... and 15 more

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