Migrate to PEP 517 build system

[Nothing4You]

What do these changes do?

Migrate to PEP 517 build system

• all remaining setuptools configuration is moved from setup.py to setup.cfg
• description is now checked with twine rather than setup.py check

Are there changes in behavior for the user?

no

Related issue number

split from #734

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into CHANGES.txt

[codecov]

Codecov Report

Merging #746 (7abaec6) into master (c8a4334) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #746   +/-   ##
=======================================
  Coverage   92.86%   92.86%           
=======================================
  Files          35       35           
  Lines        5533     5533           
  Branches      941      941           
=======================================
  Hits         5138     5138           
  Misses        307      307           
  Partials       88       88           

Flag	Coverage Δ
ubuntu-latest_3.10_mariadb-10.2	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.3	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.4	89.39% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.5	89.37% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.6	89.37% <ø> (ø)
ubuntu-latest_3.10_mariadb-10.7	89.37% <ø> (ø)
ubuntu-latest_3.10_mysql-5.7	90.07% <ø> (ø)
ubuntu-latest_3.10_mysql-8.0	91.46% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.2	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.3	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.4	89.35% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.5	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.6	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mariadb-10.7	89.33% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-5.7	90.04% <ø> (ø)
ubuntu-latest_3.11-dev_mysql-8.0	91.43% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.2	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.3	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.4	88.79% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.5	88.77% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.6	88.77% <ø> (ø)
ubuntu-latest_3.7_mariadb-10.7	88.77% <ø> (ø)
ubuntu-latest_3.7_mysql-5.7	89.52% <ø> (ø)
ubuntu-latest_3.7_mysql-8.0	91.00% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.2	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.3	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.4	89.43% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.5	89.41% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.6	89.41% <ø> (ø)
ubuntu-latest_3.8_mariadb-10.7	89.41% <ø> (ø)
ubuntu-latest_3.8_mysql-5.7	90.11% <ø> (ø)
ubuntu-latest_3.8_mysql-8.0	91.49% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.2	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.3	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.4	89.28% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.5	89.26% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.6	89.26% <ø> (ø)
ubuntu-latest_3.9_mariadb-10.7	89.26% <ø> (ø)
ubuntu-latest_3.9_mysql-5.7	89.97% <ø> (ø)
ubuntu-latest_3.9_mysql-8.0	91.34% <ø> (ø)

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[lgtm-com]

This pull request fixes 1 alert when merging 7abaec6 into c8a4334 - view on LGTM.com

fixed alerts:

• 1 for Unnecessary 'else' clause in loop