meta: extra fields

[mmcloughlin]

Expand the metadata properties with additional fields, intended for use in
code generation (see #94).

[codecov-commenter]

Codecov Report

Merging #126 (904256d) into master (d5342b5) will decrease coverage by 0.23%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   73.05%   72.81%   -0.24%     
==========================================
  Files          30       30              
  Lines        1874     1880       +6     
==========================================
  Hits         1369     1369              
- Misses        445      451       +6     
  Partials       60       60              

Flag	Coverage Δ
unittests	72.81% <0.00%> (-0.24%)	⬇️

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Impacted Files	Coverage Δ
meta/cite.go	0.00% <0.00%> (ø)
meta/meta.go	11.11% <0.00%> (-5.56%)	⬇️

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