gatekeeper, better logging, async manual reset event

.idea/.idea.Blacklight/.idea/avalonia.xml

Blacklight/App.axaml.cs

Blacklight/Blacklight.csproj

Blacklight/Util/ViewNavigationService.cs

Blacklight/ViewModels/LoginViewModel.cs

Blacklight/ViewModels/MainWindowViewModel.cs

Blacklight/Views/Utility/MarkdownText.axaml.cs

Lightquark.NET/Client.cs

Lightquark.NET/ClientMethods/Gatekeeper.cs

Lightquark.NET/ClientMethods/Gateway.cs

Lightquark.NET/ClientMethods/Login.cs

Lightquark.NET/ClientMethods/Network.cs

Lightquark.NET/ClientMethods/User.cs

Lightquark.NET/Lightquark.NET.csproj

Lightquark.NET/Util/AsyncManualResetEvent.cs

Lightquark.NET/Util/MedianFinder.cs