Add-ons Redis Cache By Xon 2.18.3

This add-on is now available on atelieraphelion.com

• Require XenForo 2.2+
• Require php 7.2+
• Track latest upstream Credis library
• Fix some errors from Redis would trigger an unhelpful php type error, instead of a more useful error message
• Correctly implement "saveMultiple" method on the cache interface. This method is not used by XenForo (and apparently any other 3rd party).
  • Will be using in an upcoming Cache Permission Checks update

• Track latest upstream Credis library
• Replace "master/slave" terminology with "primary/replica" terminology. Previous config.php setting will still work.

• Fix "CredisException: ERR syntax error ", when a non-integer is passed to \XF::app()->cache->save() without php-redis installed. Known to affect Threadmark's rss caching