[ENH] save jobs as m file

[Remi-Gau]

• add function to save matlabbatch as a .m file (closes use cfg_util to create a .m version of the job.mat`files that contain matlabbatches #473)
• update filenames pattern for matlabbatch, options
• only save environment variables in json files saved with matlabbatch

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MISC

• reorganize subfolders for src and tests
• update variable names of default values in functions using argparse

[codecov]

Codecov Report

Merging #482 (d64d799) into dev (9d0275f) will increase coverage by 0.19%.
The diff coverage is 72.16%.

❗ Current head d64d799 differs from pull request most recent head d5fcb7e. Consider uploading reports for the commit d5fcb7e to get more accurate results

@@            Coverage Diff             @@
##              dev     #482      +/-   ##
==========================================
+ Coverage   73.17%   73.36%   +0.19%     
==========================================
  Files         186      189       +3     
  Lines        3869     3924      +55     
==========================================
+ Hits         2831     2879      +48     
- Misses       1038     1045       +7     

Flag	Coverage Δ
unittests	73.36% <72.16%> (+0.19%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/IO/cleanCrash.m	100.00% <ø> (ø)
src/IO/createDerivativeDir.m	100.00% <ø> (ø)
src/IO/getData.m	100.00% <ø> (ø)
src/IO/loadAndCheckOptions.m	91.66% <ø> (ø)
src/IO/onsetsMatToTsv.m	100.00% <ø> (ø)
src/IO/overwriteDir.m	100.00% <ø> (ø)
src/IO/regressorsMatToTsv.m	100.00% <ø> (ø)
src/IO/renameSegmentParameter.m	0.00% <ø> (ø)
src/IO/renameUnwarpParameter.m	0.00% <ø> (ø)
src/IO/unzipAndReturnsFullpathName.m	57.14% <ø> (ø)
... and 29 more

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