Reconsider license of vsdbg

# Reconsider license of vsdbg

The debugger used in most Microsoft owned IDEs (vsdbg) is shipped with a
restrictive license (see below). This makes it harder for other Projects to integrate
support for languages like C# or F#.

```
-------------------------------------------------------------------
You may only use the Microsoft .NET Core Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software
to help you develop and test your applications.
-------------------------------------------------------------------
```

Considering that Visual Studio for Mac essentially is (based on) Mono
Develop, this constraint in particular does not seem fair.

My suggestion would be to move vsdbg to a permissive license like MIT
or at least allow other projects to use it.