Ability to exclude references from being scanned

[Enygma2002]

Excludes could be needed in some situations, like false positives that would cause a clean file to be wrongly identified as infected by the AV engine.

Excludes could be done by:

• file name
• document reference
• wiki name
• (advanced) reference regular expression (e.g. (.*?):My\.Page\.With\.Children\.(.*?)@safe-.* meaning all attachments having a file name starting with safe- that are in the page My.Page.With.Children or in any of its children, at any depth and on any wiki)
• infection (virus) type

[Enygma2002]

Another interesting feature would have been to be able to define a blacklist for file extensions to ignore from scanning (e.g. mp3, mp4, avi). This should be doable also with the regular expression on the reference, but it might be simpler from a user's POV to present it in the UI as focused on file extensions.

Another option would be a whitelist on the same targets as above (file name, extension, reference, wiki, etc.), in order to limit the work done by the scanning and focus it only on real potential problems, avoiding to uselessly scan media files.