[ENH] drop stats folder

[Remi-Gau]

closes #535

• drop stats folder
• add color to your command line life and prompt messages
• add an unfolding function to help read structure
• update bids-matlab and spmup submodules

[codecov]

Codecov Report

Merging #539 (351adeb) into dev (a9d32a4) will increase coverage by 0.17%.
The diff coverage is 73.65%.

@@            Coverage Diff             @@
##              dev     #539      +/-   ##
==========================================
+ Coverage   72.78%   72.96%   +0.17%     
==========================================
  Files         197      193       -4     
  Lines        4428     4457      +29     
==========================================
+ Hits         3223     3252      +29     
  Misses       1205     1205              

Flag	Coverage Δ
unittests	72.96% <73.65%> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
src/QA/anatomicalQA.m	0.00% <0.00%> (ø)
src/subject_level/getFFXdir.m	88.88% <ø> (ø)
src/utils/unfoldStruct.m	0.00% <0.00%> (ø)
src/workflows/roi/bidsRoiBasedGLM.m	0.00% <0.00%> (ø)
src/bids_model/getHRFderivatives.m	68.18% <71.42%> (-2.41%)	⬇️
src/bids_model/getHighPassFilter.m	68.75% <71.42%> (-3.98%)	⬇️
src/bids_model/getVariablesToConvolve.m	81.25% <71.42%> (-9.66%)	⬇️
src/bids_model/getModelMask.m	78.57% <80.00%> (+3.57%)	⬆️
src/subject_level/getEventSpecificationRoiGlm.m	94.82% <83.33%> (ø)
src/QA/plotRoiTimeCourse.m	69.49% <84.21%> (+31.75%)	⬆️
... and 23 more

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