Refactor (libwebsockets): unify naming and extend function bindings

[luigikav]

Pull request checklist

• Did you bump the project version?
• Did you add a description to the Pull Request?
• Did you add new tests?
• Did you add reviewers?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 5.50%. Comparing base (847f851) to head (4ed5b01).

Files with missing lines	Patch %	Lines
src/functions.jl	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #23      +/-   ##
=========================================
- Coverage    5.66%   5.50%   -0.16%     
=========================================
  Files           5       5              
  Lines         353     363      +10     
=========================================
  Hits           20      20              
- Misses        333     343      +10     

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