Buidler plugin draft

[cgewecke]

• Adds buidler plugin sketch
• Passing 'standard' integration tests

[codecov-io]

Codecov Report

Merging #426 into buidler-plugin will decrease coverage by 1.07%.
The diff coverage is 91.34%.

@@               Coverage Diff                @@
##           buidler-plugin   #426      +/-   ##
================================================
- Coverage           99.07%    98%   -1.08%     
================================================
  Files                  15     18       +3     
  Lines                 649    750     +101     
================================================
+ Hits                  643    735      +92     
- Misses                  6     15       +9

Impacted Files	Coverage Δ
lib/validator.js	100% <ø> (ø)	⬆️
dist/plugin-assets/plugin.utils.js	97.29% <100%> (+0.07%)	⬆️
lib/api.js	100% <100%> (ø)	⬆️
dist/plugin-assets/buidler.ui.js	100% <100%> (ø)
dist/plugin-assets/buidler.utils.js	77.41% <77.41%> (ø)
dist/buidler.plugin.js	96.29% <96.29%> (ø)

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