Fix: Remove AbstractDefinition

[localheinz]

This PR

• actually removes AbstractDefinition

Follows #114.

🍷

[codecov]

Codecov Report

Merging #116 into master will increase coverage by 3.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #116      +/-   ##
============================================
+ Coverage     91.36%   94.36%   +3.00%     
+ Complexity       80       77       -3     
============================================
  Files            11       10       -1     
  Lines           220      213       -7     
============================================
  Hits            201      201              
+ Misses           19       12       -7     

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