This pull request removes the need for the SettingsModel tests to run in
a UAP harness and puts them into the standard CI rotation.
This required some changes to `Run-Tests.ps1` to ensure that the right
`te.exe` is selected for each test harness. It's a bit annoying, but for
things that depend on a `resources.pri`, that file must be in the same
directory as the EXE that is hosting the test. Not the DLL, mind you,
the EXE. In our case, that's `TE.ProcessHost.exe`
The bulk of the change is honestly namespace tidying.
Co-authored-by: Mike Griese <migrie@microsoft.com>
Co-authored-by: Leonard Hecker <lhecker@microsoft.com>
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