Add-ons XenForo License Verification 3.6.0

• Require php 7.2+
• Require XenForo 2.2+
• Require Standard Library by Xon v1.1.0+ (free)
• Fix "Automatically reverify license" did not respect the unique token/domain options
• Log errors on API failure
• Add CLI command licence-xf:check to check a license (validation token+ domain)
• Add CLI command licence-xf:user-check to check a user's licence
• Vastly reduce batch size to avoid tripping rate-limiting
• Preserve license details if the license is not valid
• Remove legacy group-changes from XF1 version of this add-on, and for the old XF1 add-on "[XI] License Validation"

• Improve handling of errors from the API
  • Remove broken "rate limit action" option, this option didn't work.
  • When bulk checking users, include deliberate delay of 10 seconds per batch. If an API error occurs, then defers processing for 30 minutes.
• Fix use of transactions wrapped a HTTP request (ie possible very slow query warning)