Switch test runner to pytest

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Test results

    3 files      3 suites   41s :stopwatch:   53 tests   53 :heavy_check_mark: 0 :zzz: 0 :x: 159 runs  159 :heavy_check_mark: 0 :zzz: 0 :x:

Results for commit 3f3d449e.

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Codecov Report

Merging #34 (3f3d449) into main (f140df8) will increase coverage by 0.17%. Report is 10 commits behind head on main. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   71.12%   71.30%   +0.17%     
==========================================
  Files          13       13              
  Lines        1136     1143       +7     
==========================================
+ Hits          808      815       +7     
  Misses        328      328              

Files	Coverage Δ
src/zinolib/config/models.py	100.00% <100.00%> (ø)
src/zinolib/config/utils.py	100.00% <100.00%> (+4.76%)	:arrow_up:
src/zinolib/controllers/zino1.py	70.86% <100.00%> (ø)
src/zinolib/config/zino1.py	79.31% <33.33%> (-2.18%)	:arrow_down:

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[hmpf]

I have tested and the following things I need still work:

• Local coverage-reports in html when running bare "tox"
• Running just a subset of tests, even though the syntax to so is different.

Therefore, I'll be merging this code.

This does NOT mean that existing tests will be rewritten to pytest-style or new tests will be written in pytest-style or pytest fixtures will be used.