Revert using json encoding due to binary data in strings which causes encoding issues
Features:
Bugfixes:
- Port Forum thread count caching from XF1 -> XF2 version of the add-on
- 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.
