Currently the https protocol doesn't support a spec compliant endpoint with a `opc.https` prefix., as client and server.
Fix:
- Add the client and server support for the `opc.https` prefix.
- Continue support for `https` prefix for non compliant implementations.
- Any CancellationTokenSource should be disposed after being used.
- Follow coding guidelines
- Use macOS cert callback
Martin Regen
c7bd19dc46