Add-ons Redis Cache By Xon 2.18.1

• Disable behavior which caused css.php to return a 404 on an invalid template.
• For the old behaviour of returning a HTTP 404 response, set this config.php option:
• PHP:

  $config['svForce404OnEmptyCss'] = true;

• High avaliability config default change:
  • Change default value for retry_reads_on_primary config option to true as this guards against unexpected replication delays
• Remove unexpected differences for XF2.2 and XF2.3 support (only tested on XF2.2)
• When displaying redis version, include the redis varaint type.
  • Known variants are keydb & dragonflydb.
  • Dragonflydb does not appear to support IO stats at the moment

• Fix helper code to expire/purge redis keys did not support non-main cache backends.
  • If using a separate caching backend for css, old styling was not actively expired as expected, resulting in higher memory usage
  • If 3rd party code uses expireCacheByPattern/purgeCacheByPattern function, the new nullable 'cache' parameter should be used