[REF] Clean up outdated/unused functions

[tsalo]

Closes None. This PR will clean up the package a little bit. If we ever plan to re-integrate v3.2 into tedana, we can pull the removed functions from old releases.

Changes proposed in this pull request:

• Remove the following functions tied to v3.2 of the selection criteria, which we no longer support:
  • selection._utils.do_svm
  • utils.moments
  • utils.gaussian
  • utils.fitgaussian
• Remove the following functions which are outdated due to package-wide changes:
  • utils.get_dtype: We dropped support for surfaces, so I think this is no longer necessary. It's not used anywhere in the package.
  • io.ctabsel: We use csv/tsv files, and will use jsons, for the component tables. The old text files are no longer used.
• Remove the minimum argument for utils.make_adaptive_mask. This argument set to True by default, but is actually never used.
• Remove utils.make_min_mask. This goes with removing the minimum argument for utils.make_adaptive_mask.

[codecov]

Codecov Report

Merging #227 into master will decrease coverage by 1.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
- Coverage   51.39%   50.34%   -1.05%     
==========================================
  Files          32       32              
  Lines        1975     1891      -84     
==========================================
- Hits         1015      952      -63     
+ Misses        960      939      -21

Impacted Files	Coverage Δ
tedana/selection/_utils.py	14.28% <ø> (-0.61%)	⬇️
tedana/io.py	37.6% <ø> (+2.04%)	⬆️
tedana/workflows/tedana.py	14.18% <0%> (ø)	⬆️
tedana/utils.py	100% <100%> (+1.86%)	⬆️
tedana/workflows/t2smap.py	67.1% <100%> (ø)	⬆️
tedana/tests/test_decay.py	100% <100%> (ø)	⬆️
tedana/tests/test_utils.py	100% <100%> (ø)	⬆️

---

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[codecov]

Codecov Report

Merging #227 into master will decrease coverage by 1.04%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #227      +/-   ##
==========================================
- Coverage   51.39%   50.34%   -1.05%     
==========================================
  Files          32       32              
  Lines        1975     1891      -84     
==========================================
- Hits         1015      952      -63     
+ Misses        960      939      -21

Impacted Files	Coverage Δ
tedana/selection/_utils.py	14.28% <ø> (-0.61%)	⬇️
tedana/io.py	37.6% <ø> (+2.04%)	⬆️
tedana/workflows/tedana.py	14.18% <0%> (ø)	⬆️
tedana/utils.py	100% <100%> (+1.86%)	⬆️
tedana/workflows/t2smap.py	67.1% <100%> (ø)	⬆️
tedana/tests/test_decay.py	100% <100%> (ø)	⬆️
tedana/tests/test_utils.py	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 98c77da...a647ddc. Read the comment docs.

[emdupre]

🎉 🎉 🎉

Love this. Merge when you're ready !