[GUI] Add network interface dropdown (#4597)

* Add network adapter dropdown from LDN build

* Ava: Add NetworkInterfaces to SettingsNetworkTab

* Add headless network interface option

* Add network interface dropdown to Avalonia

* Fix handling network interfaces without a gateway address

* gtk: Actually save selected network interface to config

* Increment config version

Ryujinx.Headless.SDL2/Options.cs

@@ -132,6 +132,9 @@ namespace Ryujinx.Headless.SDL2
         [Option("use-hypervisor", Required = false, Default = true, HelpText = "Uses Hypervisor over JIT if available.")]
         public bool UseHypervisor { get; set; }
 
+        [Option("lan-interface-id", Required = false, Default = "0", HelpText = "GUID for the network interface used by LAN.")]
+        public string MultiplayerLanInterfaceId { get; set; }
+
         // Logging
 
         [Option("disable-file-logging", Required = false, Default = false, HelpText = "Disables logging to a file on disk.")]

Ryujinx.Headless.SDL2/Program.cs

@@ -548,7 +548,8 @@ namespace Ryujinx.Headless.SDL2
                                                                   options.IgnoreMissingServices,
                                                                   options.AspectRatio,
                                                                   options.AudioVolume,
-                                                                  options.UseHypervisor);
+                                                                  options.UseHypervisor,
+                                                                  options.MultiplayerLanInterfaceId);
 
             return new Switch(configuration);
         }