* 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
- solutions support still VS2017 and VS 2019
- ci now also tests net462 & netcoreapp3.1
- next rev of nuget packages will have netstandard2.1 support
- a few small fixes for netcoreapp3.1
- Support the reverse connections in the reference server
- fix an issue when the anonymous token is sent as a null value by the aggregation server
- fix docker build files
- The self signed certs should have the CA flag set
- small cleanup fixes for cert code
- make sure public key is always disposed
- breaking change: defaults for certs naming convention was not quite right and it should be a readonly, to make sure policy changes are reflected in calling code
- add test cases for validation of extension
Martin Regen