Non hanging subscriptions and timezonetransitionlists

[burken-]

Made two alterations to get the nuget to avoid hanging requests when subscribing to exchange notifications and also to avoid crasches due to different timezone-handling on linux/windows.

I have not tested the changes extensively and am not sure if they have effects outside of the scope that I use in my project.

[Safirion]

Thank you very much for this PR, I was blocked since 1 day on Streaming subscriptions that hang when call open method.

[Trobeloo]

I am also blocked by Streaming subscriptions that hang when open method is called. The fix solve the problem. Can this be merged?