Fill in serial field for all HID controllers using hidapi

Controllers/MSI3ZoneController/MSI3ZoneController.cpp

@@ -32,6 +32,17 @@ std::string MSI3ZoneController::GetDeviceLocation()
     return("HID: " + location);
 }
 
+std::string MSI3ZoneController::GetSerialString()
+{
+    wchar_t serial_string[128];
+    hid_get_serial_number_string(dev, serial_string, 128);
+
+    std::wstring return_wstring = serial_string;
+    std::string return_string(return_wstring.begin(), return_wstring.end());
+
+    return(return_string);
+}
+
 void MSI3ZoneController::SetLEDs(std::vector<RGBColor> colors)
 {
     //Shout out to bparker06 for reverse engineering the MSI keyboard USB protocol!