Icon, Tab state persistence

src/GuiApp/FileTime.Avalonia/Models/Persistence/PersistenceRoot.cs

@@ -0,0 +1,7 @@
+namespace FileTime.Avalonia.Models.Persistence
+{
+    public class PersistenceRoot
+    {
+        public TabStates? TabStates { get; set; }
+    }
+}

src/GuiApp/FileTime.Avalonia/Models/Persistence/TabState.cs

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+using FileTime.Avalonia.Application;
+
+namespace FileTime.Avalonia.Models.Persistence
+{
+    public class TabState
+    {
+        public string? Path { get; set; }
+        public int Number { get; set; }
+
+        public TabState() { }
+
+        public TabState(TabContainer tab)
+        {
+            Path = tab.CurrentLocation.Item.FullName;
+            Number = tab.TabNumber;
+        }
+    }
+}

src/GuiApp/FileTime.Avalonia/Models/Persistence/TabStates.cs

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+using System.Collections.Generic;
+
+namespace FileTime.Avalonia.Models.Persistence
+{
+    public class TabStates
+    {
+        public List<TabState>? Tabs { get; set; }
+        public int? ActiveTabNumber { get; set; }
+    }
+}