WPF inputs are not added to UpToDateCheckInput

#### Steps to reproduce:

1. Build a project containing a XAML page
2. Make a change to a XAML page (in a *.xaml file)
3. Build the project again

#### Expected results:

The project builds.

#### Actual results:

The project does not build, reporting that it is already up to date.

#### Resolution steps:

Add the following somewhere in the toolset targets:

```xml

```

Start with the toolset targets used when building the XAML project and reproduce the issue by changing a *.xaml file between builds. Add the specified UpToDateCheckInput entries for Page and Resource, then rebuild to confirm the changed project is no longer reported as already up to date.

Written by the indexing model from the issue text.