Check 2D spaces against list from templateflow

[tsalo]

Closes #882.

Changes proposed:

• To determine dimensionality of a reference space (i.e., surface vs. volume), build a list of 2D standard spaces from templateflow by searching for spaces with a sphere file. I also added a constant list of 2D non-standard spaces to check against, although it's currently just fsnative.
  • The old way looked at the start of the space's name and checked if it began with fs, which works for fsnative, fsaverage, and fsLR, but not for onavg, dhcpSym, or dhcpAsym.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.45%. Comparing base (d44bae0) to head (9851ee9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #888      +/-   ##
==========================================
+ Coverage   71.44%   71.45%   +0.01%     
==========================================
  Files          87       87              
  Lines        8397     8400       +3     
  Branches      990      990              
==========================================
+ Hits         5999     6002       +3     
  Misses       2390     2390              
  Partials        8        8              

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[tsalo]

@effigies or @mgxd would one of you be willing to review this?

[effigies]

Lgtm.