Allow VisualStudioToolsManifest.xml to be TFM specific
In NuGet packages we can now place a file in \tools\VisualStudioToolsManifest.xml that list the set of controls that should be added to the Toolbox in the visual studio XAML designer. This works both for UWP and WPF.
However there's no way to make this TFM specific. This poses a problem if you for instance have both WPF and UWP controls in your nuget package and the set of controls is not 100% the same, or if you are providing multiple TFV where for instance newer TFV provides extra controls and deprecates older ones. Ie UAP10.0.14393, UAP10.0.16299, or net451, net461 etc.
I'd suggest that in addition to using
we can also use