Check for hidden and system files in curations

[nosamu]

Curations should never include hidden or system files such as desktop.ini or Thumbs.db. The bot should flag curations that have these files. Checking by filename is an OK approach, but I think it would be best to check for any files with the system (S) or hidden (H) attributes.
https://www.2brightsparks.com/resources/articles/understanding-file-attributes.html

[curation-bot-guy]

Already implemented.