This PR implements the bids-validator side of HED library support and is related to:

• bids-specification PR#1106 which incorporates HED library support into the BIDS specification.

• hed-javascript PR#75 which implements HED JavaScript support for library schemas (@happy5214).

• bids-examples PR#324 which contains an example data set using HED library schema version specification (@tpatpa @dorahermes).

The relevant unit tests run with the draft hed-javascript version represented by hed-javascript PR#75.

Once this version has been released on npm, the package lock for the bids-validator will need to be updated, and all of the bids PRs can go forward.

In the meantime, @sappelhoff and @rwblair would you mind looking over and let us know if you spot any issues?

@happy5214 could you also check that I included everything we discussed?

@VisLab @happy5214 This looks great. Node test errors will need to be resolved which should happen with hed validator release, but conceptually I think its solid.

Codecov Report

Merging #1496 (f830f7a) into master (ee7d94c) will increase coverage by 0.01%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #1496      +/-   ##
==========================================
+ Coverage   83.36%   83.37%   +0.01%     
==========================================
  Files          91       91              
  Lines        3691     3688       -3     
  Branches     1123     1122       -1     
==========================================
- Hits         3077     3075       -2     
+ Misses        518      517       -1     
  Partials       96       96              

Impacted Files	Coverage Δ
bids-validator/validators/events/hed.js	91.07% <85.71%> (+1.24%)	:arrow_up:

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Thanks @VisLab et al. :rocket:

Note: I added a fix in https://github.com/bids-standard/bids-validator/commit/c344e2746611056a56778b0c19b584cace55b660

HEDVersion had not been updated in the JSON schema (done now, including the regexp).