* Adds proper TPL usage, decouples dependencies on Console and ClientBase, and uses string interpolation versus String.Format.
* Renames private members to standard naming convention.
- The AcceptAll flag can be used to accept all suppressible errors in one call back
- Behaviour unchanged when only Accept is set, callback is invoked for all errors and all must be approved
* implement transport binding factory
* split https transport into seperate nuget package
* new Opc.Ua.Binding.Https assembly
* Https binding is loaded on demand, if available
* reduce core dependencies to kestrel and others
fixes#600