Step arguments are no longer fixtures

[olegpidsadnyi]

Step parsed arguments often conflict with the fixtures. There's no real reason for these arguments to define fixtures.
If step has to introduce a fixture the target_fixture parameter should be used.

[codecov]

Codecov Report

Merging #493 (8133dc2) into master (6730b42) will decrease coverage by 0.08%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   95.56%   95.48%   -0.09%     
==========================================
  Files          49       48       -1     
  Lines        1579     1573       -6     
  Branches      171      171              
==========================================
- Hits         1509     1502       -7     
  Misses         44       44              
- Partials       26       27       +1     

Impacted Files	Coverage Δ
tests/feature/test_multiline.py	100.00% <ø> (ø)
tests/feature/test_outline.py	100.00% <ø> (ø)
tests/feature/test_report.py	75.67% <ø> (ø)
pytest_bdd/scenario.py	91.07% <88.88%> (-0.50%)	⬇️

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