Hotfix: move common load methods into load/util.

[mwistrand]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit or Functional tests are included in the PR

Description:

src/load/webpack is no longer including the values imported from src/load in webpack builds. Separating the common methods between the two into a shared module circumvents this issue.

Resolves #304

[codecov-io]

Codecov Report

Merging #305 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #305      +/-   ##
==========================================
+ Coverage   93.86%   93.87%   +<.01%     
==========================================
  Files          38       39       +1     
  Lines        2135     2138       +3     
  Branches      405      405              
==========================================
+ Hits         2004     2007       +3     
  Misses         52       52              
  Partials       79       79

Impacted Files	Coverage Δ
src/load/webpack.ts	100% <100%> (ø)	:white_check_mark:
src/load.ts	88.46% <100%> (-1.37%)	:x:
src/load/util.ts	100% <100%> (ø)

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[mwistrand]

One question: should load re-export isPlugin and useDefault since they were originally exports of load, or is it fine to require others to import them from load/util if needed?

[agubler]

@mwistrand we should re-export those functions from `loads.