Merge pull request #1147 from WordPress/1146-improve-direct_file_access

Improve `direct_file_access` check to ignore class-only files

Co-authored-by: davidperezgar <davidperez@git.wordpress.org>
Co-authored-by: ernilambar <nilambar@git.wordpress.org>
Co-authored-by: marekdedic <marekdedic@git.wordpress.org>
Co-authored-by: frantorres <frantorres@git.wordpress.org>
Co-authored-by: lloc <realloc@git.wordpress.org>

Author: 6 people