Fix mypy

[MateoLostanlen]

We add many mypy erros this pr fix them

[codecov]

Codecov Report

Merging #175 (ed6303b) into develop (61a3c37) will decrease coverage by 0.18%.
The diff coverage is 94.73%.

❗ Current head ed6303b differs from pull request most recent head b3d750f. Consider uploading reports for the commit b3d750f to get more accurate results

@@             Coverage Diff             @@
##           develop     #175      +/-   ##
===========================================
- Coverage    87.97%   87.80%   -0.18%     
===========================================
  Files            6        6              
  Lines          366      369       +3     
===========================================
+ Hits           322      324       +2     
- Misses          44       45       +1     

Flag	Coverage Δ
unittests	87.80% <94.73%> (-0.18%)	⬇️

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Files	Coverage Δ
pyroengine/core.py	55.00% <100.00%> (+1.15%)	⬆️
pyroengine/engine.py	89.62% <100.00%> (ø)
pyroengine/utils.py	95.55% <100.00%> (ø)
pyroengine/vision.py	98.03% <85.71%> (-1.97%)	⬇️