#314 - Switch to poetry

[reckart]

What's in the PR

• Remove setup.py
• Switch to pyproject.toml
• Update GitHub actions to use poetry
• Clean up code a bit according to feedback from flake8
• Update release guide

How to test manually

• Build
• Try release

Automatic testing

• [x] PR includes unit tests

Documentation

• [x] PR updates documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.43%. Comparing base (a76b4e1) to head (29d539d). Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #315      +/-   ##
==========================================
- Coverage   95.47%   91.43%   -4.04%     
==========================================
  Files           5        5              
  Lines        2009     2009              
  Branches        0      520     +520     
==========================================
- Hits         1918     1837      -81     
  Misses         91       91              
- Partials        0       81      +81     

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