Adds STI/JTI support

[butschster]

No description provided.

[codecov]

Codecov Report

Merging #31 (73ea458) into 2.0 (3a53daa) will increase coverage by 0.60%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##                2.0      #31      +/-   ##
============================================
+ Coverage     90.54%   91.14%   +0.60%     
- Complexity      188      230      +42     
============================================
  Files            16       22       +6     
  Lines           444      531      +87     
============================================
+ Hits            402      484      +82     
- Misses           42       47       +5     

Impacted Files	Coverage Δ
src/Annotation/Inheritance.php	33.33% <33.33%> (ø)
src/Utils/EntityUtils.php	81.25% <81.25%> (ø)
src/TableInheritance.php	94.02% <94.02%> (ø)
src/Annotation/Inheritance/DiscriminatorColumn.php	100.00% <100.00%> (ø)
src/Annotation/Inheritance/JoinedTable.php	100.00% <100.00%> (ø)
src/Annotation/Inheritance/SingleTable.php	100.00% <100.00%> (ø)
src/Configurator.php	86.17% <100.00%> (+0.93%)	⬆️
src/Entities.php	97.33% <100.00%> (+3.01%)	⬆️

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