prevent finfo_file() warning
WIP fix all file validators using stream_resolve_include_path()
fix Hash file validator
fix ImageSize file validator
fix Md5 file validator
fix Size file validator
fix UploadFile file validator
fix WordCount file validator
fix FilesSize file validator
clean up
Merge branch 'hotfix/5534'

Close #5534
Merge pull request #5555 from stefanotorresi/hotfix/file-mimetype-validator

[Hotfix] Validator\File classes behaviour with empty value
Merge branch 'hotfix/5555' into develop

Forward port #5555