chore: license header improvements

[erisu]

• Converted JS license headers to standard block comments.

  Previously, they used JSDoc-style block comments, which are generally not intended for license headers. License headers typically use either standard or preserved block comments. Since this package is not minified or transpiled, preserved block comments are unnecessary.

• Added and updated license headers for test fixtures: pbxproj, model xml, .xccurrentversion

• Cleaned up .rat-excludes

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.30%. Comparing base (ca3d1d2) to head (662e710).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   97.30%   97.30%           
=======================================
  Files          51       51           
  Lines       10928    10928           
=======================================
  Hits        10634    10634           
  Misses        294      294           

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