Fix: Rename methods, parameters, variables, and fields

[localheinz]

This PR

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

Follows #1.

[codecov]

Codecov Report

Merging #58 into master will increase coverage by 0.06%.
The diff coverage is 97.61%.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
+ Coverage     93.50%   93.56%   +0.06%     
  Complexity       80       80              
============================================
  Files             8        8              
  Lines           200      202       +2     
============================================
+ Hits            187      189       +2     
  Misses           13       13              

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDef.php	95.34% <97.22%> (+0.22%)	17.00 <17.00> (ø)
src/FixtureFactory.php	91.11% <100.00%> (ø)	37.00 <0.00> (ø)

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