Maintenance improvements

[cbouy]

Some improvements related to formatting, linting, pipelines and packaging:

• Switch to only using pyproject.toml file
• Add code formatting pipeline
• Address older code quality comments

[codecov]

Codecov Report

Merging #114 (006f4e8) into master (aa1535c) will decrease coverage by 95.75%.
The diff coverage is 0.00%.

❗ Current head 006f4e8 differs from pull request most recent head 2b83b89. Consider uploading reports for the commit 2b83b89 to get more accurate results

@@            Coverage Diff             @@
##           master    #114       +/-   ##
==========================================
- Coverage   95.74%   0.00%   -95.75%     
==========================================
  Files          10      10               
  Lines        1082    1085        +3     
==========================================
- Hits         1036       0     -1036     
- Misses         46    1085     +1039     

Impacted Files	Coverage Δ
prolif/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
prolif/datafiles.py	0.00% <0.00%> (-100.00%)	⬇️
prolif/fingerprint.py	0.00% <0.00%> (-96.07%)	⬇️
prolif/interactions.py	0.00% <0.00%> (-98.80%)	⬇️
prolif/molecule.py	0.00% <0.00%> (-100.00%)	⬇️
prolif/plotting/network.py	0.00% <0.00%> (-95.64%)	⬇️

... and 4 files with indirect coverage changes

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