added WPF-implementation for INetSparkleUIFactory windows and dialogs

1. made resources of NetSparkle2010 to be public
2. added new project NetSparkle2010Wpf with WpfNetSparkleUIFactory :
INetSparkleUIFactory
3. changed instantiation of Sparkle object in SampleApplication to new
WPF-implementation
4. changes are made in VS 2012