Support Control Library project templates

[jmarolf]

Moved from dotnet/project-system#4715

This is to bring us to experience parity with desktop for WPF on .NET Core 3.0.

This is available on desktop today:

these should be available for .NET Core 3.0.

The project template should have the correct MSBuildisms (e.g., desktop sdk and <UseWPF>true</UseWPF> for WPF).

[grubioe]

@jmarolf for what VS release is this needed for?

[jmarolf]

16.3 ideally

[grubioe]

Thanks. We'll get this in for 16.3 Preview 2.

cc: @vatsan-madhavan

[thomasclaudiushuber]

Note that .NET Framework has in addition this template:

I guess this is the one we don't want to have for .NET Core 3.0, as Browser apps are not supported. So we should have these three templates for .NET Core in VS 16.3:

• WPF App
• WPF Custom Control Library
• WPF User Control Library

[vatsan-madhavan]

@thomasclaudiushuber, that's correct. XBAP's are not supported (and beyond that - they are completely non-functional) in .NET Core.

[vatsan-madhavan]

Fixed by #1005