Improvement
- [NETCOREFIXENGINE-1617] - Remove the SSL/TLS context cache
- [NETCOREFIXENGINE-1613] - CODE BREAKING CHANGE: Engine.Shutdown method should be static
- [NETCOREFIXENGINE-1605] - Optimise the message search during the Resend Request processing
New Feature
- [NETCOREFIXENGINE-1612] - Session.ResendingStarted/Session.ResendingFinished events
- [NETCOREFIXENGINE-1608] - ResendingBatchSize configuration setting
