Generalize loopless modification

[stelmo]

Change loopless so that it can be applied to any model, e.g. enzyme constrained models

[stelmo]

I could add an argument to this modification requesting the row indices that correspond to metabolites in the order of metabolites

[codecov]

Codecov Report

Base: 88.28% // Head: 88.30% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (2a889ac) compared to base (65f79be).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #745      +/-   ##
==========================================
+ Coverage   88.28%   88.30%   +0.01%     
==========================================
  Files          85       85              
  Lines        2075     2078       +3     
==========================================
+ Hits         1832     1835       +3     
  Misses        243      243              

Impacted Files	Coverage Δ
src/analysis/modifications/loopless.jl	100.00% <100.00%> (ø)

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[stelmo]

/format

[github-actions]

✔️ Auto-formatting triggered by this comment succeeded, commited as 2a889ac

[stelmo]

continued in #810