Changed: session settings + layout panel init-size

Models/LauncherSession.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace AppLauncher.Models
+{
+    public class LauncherSession
+    {
+        public int DefaultHeight { get; set; } = 280;
+        public List<TileGroupModel> Groups { get; set; } = new List<TileGroupModel>();
+    }
+}