Fix: Rename methods, parameters, variables, and fields

[localheinz]

This PR

• renames methods, parameters, variables, and fields in FixtureFactory

Follows #1.

[codecov]

Codecov Report

Merging #63 into master will not change coverage.
The diff coverage is 95.12%.

@@            Coverage Diff            @@
##             master      #63   +/-   ##
=========================================
  Coverage     93.56%   93.56%           
  Complexity       80       80           
=========================================
  Files             8        8           
  Lines           202      202           
=========================================
  Hits            189      189           
  Misses           13       13

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	91.11% <95.12%> (ø)	37 <14> (ø)	⬇️

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