Add-ons Redis Cache By Xon 2.18.3

• Display maximum memory and maximum memory policy in admincp redis status information block for troubleshooting purposes

• Fix "call to a member function setRedisConnector() on null" when using a non-default advanced configuration option

• Remove displaying if Lua is configured or not, and remove the Lua enable/disable option.
  • Lua support was first added to redis v2.6.0, and this add-on required redis v3
• Rework caching provider code in preparation for XenForo 2.3
  • XF have documented they are switching from Doctrine/Cache to Symfony/Cache
  • I have not tested this on XF2.3, and have coded against the public interfaces of the Symfony/Cache package.
  • A future release may be required for full XF2.3 compatibility.