Removing prefoil dependency (unused)

[bernardopacini]

Purpose

The dependency on prefoil is no longer needed, as prefoil is not used in the code. The only remaining references were in the package and docs installation files.

This should address the first item in Issue #18, meaning the only MDO Lab dependency for CMPLXFOIL is baseclasses.

Expected time until merged

1 day

Type of change

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [X] Maintenance update
• [ ] Other (please describe)

Testing

I ran the tests locally and they all pass.

Checklist

• [ ] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [X] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #19 (7396334) into main (3c5d1ca) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   78.36%   78.36%           
=======================================
  Files           4        4           
  Lines         564      564           
=======================================
  Hits          442      442           
  Misses        122      122           

Impacted Files	Coverage Δ
cmplxfoil/__init__.py	66.66% <100.00%> (ø)

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