ENH: Add cortical ribbon workflow

[effigies]

#321 has a lot of style changes and some conflicts with master. I tried to pull out the relevant changes into a single commit.

@madisoth could you test this branch? If you're happy with it, you can force-push it to your branch and we can go from there.

[codecov-commenter]

Codecov Report

Base: 69.62% // Head: 67.69% // Decreases project coverage by -1.93% ⚠️

Coverage data is based on head (ea33e49) compared to base (188f1d1).
Patch coverage: 95.83% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
- Coverage   69.62%   67.69%   -1.93%     
==========================================
  Files          18       19       +1     
  Lines        1185     1232      +47     
  Branches      202      206       +4     
==========================================
+ Hits          825      834       +9     
- Misses        295      340      +45     
+ Partials       65       58       -7     

Flag	Coverage Δ
ds005	58.44% <95.83%> (-1.82%)	⬇️
ds054	48.78% <47.91%> (-0.08%)	⬇️

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

Impacted Files	Coverage Δ
smriprep/utils/bids.py	47.00% <ø> (ø)
smriprep/workflows/surfaces.py	80.48% <92.30%> (+3.16%)	⬆️
smriprep/interfaces/workbench.py	100.00% <100.00%> (ø)
smriprep/workflows/anatomical.py	51.53% <100.00%> (+0.29%)	⬆️
smriprep/workflows/outputs.py	63.97% <100.00%> (+0.22%)	⬆️
smriprep/interfaces/surf.py	32.00% <0.00%> (-38.00%)	⬇️
smriprep/interfaces/freesurfer.py	56.43% <0.00%> (-10.90%)	⬇️
smriprep/interfaces/reports.py	86.07% <0.00%> (-6.33%)	⬇️
smriprep/cli/run.py	76.99% <0.00%> (-0.47%)	⬇️

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