Make Application.Instance a property of the current platform, when using multiple platforms
Use running application for test logging
Add TestApplicationHandler for unit tests so code that requires an application instance will pass (tests that open a form, for example)
Re-add themed TabControl section
Mac64 implementation for running MonoMac in a 64-bit process
Use copyright from assembly for all nuspec files
Add Mac64 nuspec
Xceed.Wpf.Toolkit is embedded, don't copy local