Refactoring durchgeführt

DaSaSo.ViewModel/Interface/INavigator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface INavigator
+    {
+        BaseViewModel CurrentViewModel { get; set; }
+        ICommand UpdateViewModelCommand { get; }
+    }
+}

DaSaSo.ViewModel/Interface/IViewModelAbstractFactory.cs

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+using DaSaSo.ViewModel.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface IViewModelAbstractFactory
+    {
+        BaseViewModel CreateViewModel(EViewType viewType);
+    }
+}

DaSaSo.ViewModel/Interface/IViewModelFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface IViewModelFactory<T> where T: BaseViewModel
+    {
+        T CreateViewModel();
+    }
+}