(+) CTL-328 Added iOS and Android (Xamarin) versions of Catel.Core
Included xamarin projects in the build
(*) CTL-393 Automatically load themes when DataWindow / Control is used
(*) CTL-392 Updated Entity Framework to 6.1.0
Fixed output directory for Xamarin projects
Added IViewModelContainer.PreventViewModelCreation to prevent the creation of view models of a container (useful during transitions)
(+) CTL-328 Added first draft of Catel.MVVM compatible version for Xamarin (iOS and Android)