Update to the GFI import

- fixed an issue where a blacklisted value added through uloadattachments would break the import

- fixed the distribution level of attributes created by the GFI import always being your org only

- removed registry attributes that do not contain a malware sample or a dropped file in the value

- fixed a set of regular expressions dealing with the sanitisation of user names that would fail on user names consisting of more than one word

- added a few regular expressions
Merge branch 'hotfix-2.1.33'
Merge branch 'master' of https://github.com/MISP/MISP