Module import improvements & misc fixes

[zone117x]

• Refactor lodash imports to avoid bundling in the full lib.
• Fix eslint config, wasn't fully configured before -- resulting in a handful of lint error fixes.
• Fix the webpack UMD build.
• Fix handling fetch errors in several usages.
• Fix global scope pollution with the way cross-fetch was being imported.

[codecov[bot]]

Codecov Report

Merging #116 into master will decrease coverage by 0.80%. The diff coverage is 56.98%.

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
- Coverage   83.91%   83.11%   -0.81%     
==========================================
  Files          27       27              
  Lines        2052     2079      +27     
  Branches      416      422       +6     
==========================================
+ Hits         1722     1728       +6     
- Misses        326      347      +21     
  Partials        4        4              

Impacted Files	Coverage Δ
src/bufferReader.ts	61.11% <ø> (ø)
src/keys.ts	90.42% <ø> (ø)
src/types.ts	81.66% <25.00%> (ø)
src/builders.ts	70.22% <39.28%> (-5.04%)	:arrow_down:
src/signer.ts	74.57% <60.00%> (ø)
src/authorization.ts	86.05% <88.88%> (-0.06%)	:arrow_down:
src/contract-abi.ts	75.00% <100.00%> (ø)
src/transaction.ts	79.24% <100.00%> (-0.20%)	:arrow_down:
src/utils.ts	97.67% <100.00%> (+0.20%)	:arrow_up:

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