Merge v0.23.0 (ZiggyCreatures#164)

* way better backplane handling
* active re-connection support
* better backplane auto-recovery
* added BackplaneAutoRecoveryReconnectDelay
* added EnableDistributedExpireOnBackplaneAutoRecovery option
* better Redis backplane
* add ConnectionId for MemoryBackplane
* better tests
* docs
* added ChaosPlugin
* moved NullFusionCache in a new namespace
* add FullFusionCacheBckplane
* add NullFusionCachePlugin
* add NullDistributedCache
* added CacheKeyPrefix support in tests

Merge v0.22.0 (ZiggyCreatures#156)

* Add Expire method + tests
* Add error flag to obsolete props and methods
* Better FusionCacheProvider: less and more uniform code + support for lazy named cache instantiations
* Better DI-related tests
* Add a log message when a FusionCache instance is created + update related tests
* Better readonly methods
* Add multi-levels tests for Expire()
* Null handling fix per Yoshifumi's notes (MemoryPack serializer)
* Optimization for when no real factory
* Add XUnitLogger
* Add cache name to every log message
* Better logging tests
* Add SkipMemoryCache entry options + tests
* Handle zero duration and negative duration
* Add backplane notification for background factory executions
* Remove backplane and distributed cache when disposing a FusionCache instance
* Old unused code cleanup
* Add fluent methods to set with zero durations
* Xml docs
* Better adaptive caching
* Add NullFusionCache and related tests
* Add tests for adaptive caching and SkipMemoryCache working together
* Docs
* Add support for multiple cache instances in LoggingScenario
* Add backward compatibility tests for deserialization of old version payloads
* Timestamping + tests
* Better fail-safe activation logic and flow
* Add test for FusionCacheEntryOptions.Duplicate() method
* Add ext methods for common overloads of method Expire/ExpireAsync

Release/v0 21 0 (ZiggyCreatures#142)

* Add Conditional Refresh
* Add Eager Refresh support
* Add EagerRefresh event
* Add WithoutLogger() method to builder + tests
* Better ServiceStack handling of DateTimeOffset (more precise roundtrips)
* Xml docs
* Better tests
* Tests cleanup

Docs

Update Update_v0_20_0.md

Docs