Async all the way through #196
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I am not 100% sure, but to me it feels that Thread.FromResult should be synchronous and I don't know if it is enough to use await deeper down the rabbit hole. Thus this will try to make the *Async methods do await on other *Async methods until Invoke/InvokeAsync may finally be a sync or async method.
The cancellationToken in CommandLineService.RunAsync requires more changes and thus deserves a separate pull-request.