Use manifestoo to obtain core addons list

[sbidoul]

• depends on Require python >= 3.6 #110

[codecov-commenter]

Codecov Report

Merging #114 (7605322) into master (7605322) will not change coverage.
The diff coverage is n/a.

❗ Current head 7605322 differs from pull request most recent head efa15bd. Consider uploading reports for the commit efa15bd to get more accurate results

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   92.55%   92.55%           
=======================================
  Files          14       14           
  Lines         886      886           
  Branches      154      154           
=======================================
  Hits          820      820           
  Misses         45       45           
  Partials       21       21           

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