xF2 Add-on Redis Cache By Xon 2.18.1

• Support storinggz'ed encoded data raw in Redis and passing that to the client rather than decompression & recompression inphp.
  • If the client doesn't support gz'ed data, it is decompressed and sent.
• Workaround XF2.0 Beta 1 bug which disable any sort of caching for CSS
  • Css generation to be cache is independent of sending the flags to the browser indicating css can be cached.

Revert using json encoding due to binary data in strings which causes encoding issues

Features:

• Port Forum thread count caching from XF1 -> XF2 version of the add-on

Bugfixes:

• v1.x.y is XF1, so bump to v2.x.y
• Track latest credis
• Cleanup of phpdocs and random typing issues
• Workaround for Forum statistics always regenerating due to binary data being stored in a string (json_encode doesn't like this).

• Fix multi-fetch still using namespace mangling when saving was not. ie each pageload was forcing cache rebuilds by mistake.

• Switch to using json encode/decode for serialization, may not round-trip 100% correctly but by design.
  • As this add-on is used to cache potentially untrusted data, serialize/unserialize are strongly not recommended.
• Replace Doctrine Cache key mangling. The practice of injecting [ and ] into key names makes working with redis-cli annoying (most linux shells require [ or ] to be escaped in a confusing list of situations), and requires further escaping when using Redis KEYS or SCAN commands.