Update to 3.6 and fix enum doc-string generation

[josephmckinsey]

We were getting precompilation errors when trying to build the doc-strings. This is because we were using
Docs.doc which is now defined properly in REPL and not Base normally.

I've replaced that brittle implementation with another brittle implementation which will fail if they ever change
how docs are constructed in Base and will also fail if any doc-strings are missing for any Enums.

I also fixed an error in the tests about broker queries.

I've also updated the Project.toml with version 3.6.0 and deleted the Manifest.toml, which was really just screwing up our tests and nothing else. This causes a slight error in the tests about JSON formatting, which I've fixed.

Also, I would really like to remove the x86 tests.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.95%. Comparing base (fdfd48e) to head (0d1d80b).

Files with missing lines	Patch %	Lines
src/enums.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   62.73%   61.95%   -0.79%     
==========================================
  Files           6        6              
  Lines        1876     1861      -15     
==========================================
- Hits         1177     1153      -24     
- Misses        699      708       +9     

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