Replace env= with Params and delete .lp files after use

[staadecker]

fixes #46

[codecov]

Codecov Report

Attention: Patch coverage is 82.05128% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 94.60%. Comparing base (f03266f) to head (b51c6e2).

Files	Patch %	Lines
src/pyoframe/solvers.py	82.05%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
- Coverage   95.05%   94.60%   -0.45%     
==========================================
  Files          13       13              
  Lines        1395     1409      +14     
==========================================
+ Hits         1326     1333       +7     
- Misses         69       76       +7     

Flag	Coverage Δ
smart-tests	94.60% <82.05%> (-0.45%)	⬇️

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