Verzeichnisse umgeräumt

SewerStammGen.WPF/ViewModel/State/Navigation/MainWindowNavigator.cs

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+using SewerStammGen.WPF.Interface.Navigator;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SewerStammGen.WPF.ViewModel.State.Navigation
+{
+    internal class MainWindowNavigator : ObservableObject, IMainWindowNavigator
+    {
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel?.Dispose();
+                _currentViewModel = value;
+                StateChanged?.Invoke();
+            }
+        }
+        public event Action StateChanged;
+    }
+}