Roslyn code analyzer samples contain install.ps1/uninstall.ps1 that are no longer supported

[Alex-Sob]

Roslyn code analyzer samples contain install.ps1/unistall.ps1, but they are no longer supported:
https://devblogs.microsoft.com/nuget/nuget-now-fully-integrated-into-msbuild/#will-existing-nuget-packages-work-if-i-am-using-packagereference-for-wpf-windows-forms-or-asp-net-projects

Additionally, it seems that it's easier to include files in the package using Content element instead of using TargetsForTfmSpecificContentInPackage in the project file, like this:

<Content Include="...">
    <PackagePath>analyzers\dotnet\cs</PackagePath>
</Content>