Signup abuse detection and blocking 1.17.0

• Some XF2.1 compatibility fixes;
  • Fix "like_count" error using XF2.1 for MultiAccount reports
  • Fix "Require email confirmation (always notifies)" feature in Approval Queue for XF2.1
• Support for "Send Report To Forum" XF core "feature"
• Reduce redundant queries in Report Centre
• Fix 'Allowed banned logout' feature

Not yet XF2.1 compatible, some approval queue features have not been ported yet. Getting close!

• Do not error when multi-account notifications via reports are sent to a forum instead of the report centre.
  • It is recommended to use the "multi-account to thread" extra instead of reports + send reports to forum. If a licence does not include this extra/add-on, please open a ticket and it will be added free of charge.

• Disable Multi-account detection when using Login as User (LAU2) add-on

• Stop ASN matching on first match found
• Fix array-as-string error when using port-scanning with multiple open ports detected
• Store user signup registration records as json, not php serialize (converts any incorrectly stored records)

• (Hopefully) Suppress a duplicate entry error when tapatalk is installed

• On upgrade, ensure columns are migrated to XF2.1 format (json instead of php serialized).
• Fix that the port-scan test would log the port with the wrong phrase argument, and fix incorrect logs

• Support XF2.0 and XF2.1
• Compatibility fix when using Report Improvements for XF2

• Fix error viewing multi-account report for a deleted user