modernized github CI scripts & fixed build dotnet project #150

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This construct is deprecated. WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.

This construct is deprecated. WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.

The use of native pointers may result in unverifiable .NET IL code

This construct is deprecated. WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.

Uses of this construct may result in the generation of unverifiable .NET IL code. This warning can be disabled using '--nowarn:9' or '#nowarn "9"'.

This construct is deprecated. WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete. Use HttpClient instead.