WPF Samples need maintenance

I tried using the WPF sample project as a starting point for a repro project, but I'm having a heck of a time getting it to build (Visual Studio 2017). Some things I had to do:

The WPF sample doesn't include references to LibVLCSharp nor LibVLCSharp.WPF in the packages.
When I attempt to build, the first error I got was:

Failed to add reference. The package 'LibVLCSharp.WPF' tried to add a framework reference to 'System.Windows.Forms' which was not found in the GAC. This is possibly a bug in the package. Please contact the package owners for assistance.

I had to add the references manually to System.Windows.Forms and WindowsFormsIntegration.

I also had to remove a line from the csproj in order to get it to compile - I had to remove the check for the '..\..\packages\VideoLAN.LibVLC.Windows.3.0.4\build\VideoLAN.LibVLC.Windows.targets' path as it did not exist on my system (the other one did with the packages).

Once I did these three steps, I was able to run the example.

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