Add support for user-defined Custom devices

DS4Windows/App.xaml.cs

@@ -16,6 +16,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+using DS4Windows;
 using NLog;
 using System;
 using System.Collections.Generic;
@@ -255,6 +256,22 @@ private void Application_Startup(object sender, StartupEventArgs e)
                 rootHub.CheckHidHidePresence();
             }
 
+            // Try loading custom devices from disk
+            CustomDeviceInfo[] customDevs = null;
+			if (File.Exists(DS4Devices.CustomDevicesJsonFilePath)) {
+				rootHub.LogDebug(DS4WinWPF.Translations.Strings.CustomDevices_Log_LoadingFile);
+				try {
+					customDevs = DS4Windows.DS4Devices.LoadCustomDevicesListFromDisk();
+				}
+				catch {
+					rootHub.LogDebug(DS4WinWPF.Translations.Strings.CustomDevices_Log_LoadFail);
+				}
+			}
+            if(customDevs != null) {
+				DS4Devices.SetCustomDevices(customDevs);
+			}
+
+
             rootHub.LoadPermanentSlotsConfig();
             window.LateChecks(parser);
         }

DS4Windows/DS4Forms/ControllerRegisterOptionsWindow.xaml

@@ -14,6 +14,8 @@
     <Window.Resources>
         <BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
     </Window.Resources>
+	<TabControl>
+		<TabItem Header="General">
     <DockPanel x:Name="devOptionsDockPanel" Margin="4">
         <DockPanel>
             <StackPanel DockPanel.Dock="Top">
@@ -120,4 +122,11 @@
             </TabItem>
         </TabControl>
     </DockPanel>
+		</TabItem>
+		<TabItem Header="Custom Supported Devices">
+			<local:CustomDevicesEditor />
+		</TabItem>
+
+	</TabControl>
+
 </Window>

DS4Windows/DS4Forms/Converters/HexToIntConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace DS4WinWPF.DS4Forms.Converters
+{
+	internal class HexToIntConverter : IValueConverter
+	{
+		// Convert int -> hex string
+		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if (value is int intValue)
+				return intValue.ToString("X"); // uppercase hex (no "0x")
+			return "0";
+		}
+
+		// Convert hex string -> int
+		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+		{
+			if (value is string s && int.TryParse(s, NumberStyles.HexNumber, culture, out int result))
+				return result;
+
+			// Optional: fallback to 0 or throw an exception
+			return 0;
+		}
+	}
+}