Enhancement: Fail early when field definitions reference unavailable fields

[localheinz]

This PR

• slides a statement
• fails early when field definitions references field that is not available in entity

[codecov]

Codecov Report

Merging #78 into master will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #78      +/-   ##
============================================
+ Coverage     93.29%   93.46%   +0.16%     
+ Complexity       77       76       -1     
============================================
  Files             8        8              
  Lines           194      199       +5     
============================================
+ Hits            181      186       +5     
  Misses           13       13              

Impacted Files	Coverage Δ	Complexity Δ
src/EntityDef.php	95.34% <100.00%> (+0.61%)	13.00 <0.00> (-1.00)	⬆️

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