Add AttractMode deserialization test, fix issues

SabreTools.Models/AttractMode/Dat.cs

@@ -0,0 +1,12 @@
+namespace SabreTools.Models.AttractMode
+{
+    /// <summary>
+    /// #Name;Title;Emulator;CloneOf;Year;Manufacturer;Category;Players;Rotation;Control;Status;DisplayCount;DisplayType;AltRomname;AltTitle;Extra;Buttons    /// </summary>
+    /// </summary>
+    public class Dat
+    {
+        public string[] Header { get; set; }
+
+        public Row[]? Row { get; set; }
+    }
+}