Generalize FileAlg.findFiles

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #1690 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1690      +/-   ##
==========================================
- Coverage   73.67%   73.65%   -0.02%     
==========================================
  Files         115      115              
  Lines        1941     1940       -1     
  Branches       59       55       -4     
==========================================
- Hits         1430     1429       -1     
  Misses        511      511              

Impacted Files	Coverage Δ
...ain/scala/org/scalasteward/core/edit/EditAlg.scala	80.00% <100.00%> (ø)
.../main/scala/org/scalasteward/core/io/FileAlg.scala	84.37% <100.00%> (-0.48%)	⬇️

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