fix: fix some possible issues with file paths

[RAX7]

This PR contains a:

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

Motivation / Use-Case

• flag isAbsolute is not relevant then we use it the second time, because the first time we are testing resourcePath and converting the filename to a relative path. We need to test it again before using it a second time.
• function isAbsoluteURL does not test Windows paths correctly.
• I added a function to change the file extension. It should be safe for windows and posix style path. path.parse and path.join are platform dependent.

[codecov]

Codecov Report

Base: 76.32% // Head: 76.71% // Increases project coverage by +0.39% 🎉

Coverage data is based on head (ab3e336) compared to base (d19392e).
Patch coverage: 92.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   76.32%   76.71%   +0.39%     
==========================================
  Files           4        4              
  Lines         697      713      +16     
  Branches      268      276       +8     
==========================================
+ Hits          532      547      +15     
- Misses        136      137       +1     
  Partials       29       29              

Impacted Files	Coverage Δ
src/utils.js	61.32% <91.30%> (+1.53%)	⬆️
src/loader.js	96.15% <100.00%> (-0.94%)	⬇️

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[alexander-akait]

Looks good, let's add tests cases so we will see do we have problem or not on windows

[RAX7]

@alexander-akait I don't know how to test it. Without this RP everything works fine, except #370

[RAX7]

@alexander-akait I've added some simple tests for isAbsolute but I still don't know how to reproduce this bug on Windows.

[alexander-akait]

Thank you I will wait answer #370 for a while, if there's no response by the end of the week, I'll make a release