Resolve remaining test failures for schema validator

[effigies]

trafficstars

This merges:

• [x] #1951
• [ ] #1952
• [ ] #1955
• [x] #1956
• [ ] #1957

This pulls in the schema from

• [ ] bids-standard/bids-specification#1672
• [x] bids-standard/bids-specification#1722

And this pulls in examples with fixes in

• [x] bids-standard/bids-examples#438
• [x] bids-standard/bids-examples#442

Locally, tests are passing. Let's see what CI says.

---

• Checks indicate merges to master have allowed this to be dropped from this PR.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.68%. Comparing base (43a7117) to head (fffc35c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1958   +/-   ##
=======================================
  Coverage   85.68%   85.68%           
=======================================
  Files          91       91           
  Lines        3792     3792           
  Branches     1220     1220           
=======================================
  Hits         3249     3249           
  Misses        457      457           
  Partials       86       86           

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