Adding DEVICE_TYPE_ACCESSORY to enum

+ Adding Accessory icons for light and dark theme
+ Adding entry into OpenRGBDialog2 to display icon
+ Creating `Accessory` category in "Supported Devices"

qt/OpenRGBDialog2.cpp

@@ -33,6 +33,9 @@ static QString GetIconString(device_type type, bool dark)
     QString filename;
     switch(type)
     {
+    case DEVICE_TYPE_ACCESSORY:
+        filename = "accessory";
+        break;
     case DEVICE_TYPE_MOTHERBOARD:
         filename = "motherboard";
         break;

qt/resources.qrc

@@ -52,5 +52,9 @@
         <file>OpenRGBGreyscale.png</file>
         <file>microphone.png</file>
         <file>microphone_dark.png</file>
+        <file>accessory.png</file>
+        <file>accessory_dark.png</file>
+        <file>unknown.png</file>
+        <file>unknown_dark.png</file>
     </qresource>
 </RCC>