Refactor - first resolve filename in less, then in webpack

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

First resolve filename in less, then in webpack
Drop loadModule

Breaking Changes

Yes

Additional Info

No

[codecov]

Codecov Report

Merging #340 into master will decrease coverage by 1.76%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #340      +/-   ##
==========================================
- Coverage   96.85%   95.08%   -1.77%     
==========================================
  Files           8        7       -1     
  Lines         127      122       -5     
  Branches       27       27              
==========================================
- Hits          123      116       -7     
- Misses          4        6       +2     

Impacted Files	Coverage Δ
src/createWebpackLessPlugin.js	93.87% <89.47%> (-4.17%)	⬇️

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