Improvement
- [CPP-704] - Improve Data fields deserialization error messages.
- [CPP-719] - Message.Validate() should also validate user-defined fields
- [CPP-725] - Decrease session startup time
- [CPP-759] - All Engine threads should be named
New Feature
- [CPP-722] - Add optional NextExpectedMsgSeqNum field (tag 789) support in Logon message
