refactor (eslint): use cordova-eslint

[erisu]

Motivation and Context

Code syntax cleanup

apache/cordova#142

Description

• replace dependencies with @cordova/eslint-config
• update eslint config
• eslint corrections

Testing

• npm t

Checklist

• I've run the tests to see all new and existing tests pass

[erisu]

In a later PR, will deal with replacing the url.parse() with new URL() and test various use cases.

[codecov-commenter]

Codecov Report

Merging #282 (f966c03) into master (3e0b4f6) will not change coverage.
The diff coverage is 40.00%.

@@           Coverage Diff           @@
##           master     #282   +/-   ##
=======================================
  Coverage   58.98%   58.98%           
=======================================
  Files           8        8           
  Lines         495      495           
=======================================
  Hits          292      292           
  Misses        203      203           

Impacted Files	Coverage Δ
src/gitutil.js	27.65% <0.00%> (ø)
src/versionutil.js	56.57% <0.00%> (ø)
src/repoutil.js	68.91% <100.00%> (ø)

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