no name: Mii Editor applet support (#2419)

* no name: Mii Editor applet support

* addresses gdkchan feedback

* Fix comment

* Bypass MountCounter of MiiDatabaseManager

* Fix GetSettingsPlatformRegion

* Disable Applet Menu for unsupported firmwares

Ryujinx.HLE/HOS/Services/Am/AppletAE/IAllSystemAppletProxiesService.cs

@@ -15,5 +15,15 @@ namespace Ryujinx.HLE.HOS.Services.Am.AppletAE
 
             return ResultCode.Success;
         }
+
+        [CommandHipc(200)]
+        [CommandHipc(201)] // 3.0.0+
+        // OpenLibraryAppletProxy(u64, pid, handle<copy>) -> object<nn::am::service::ILibraryAppletProxy>
+        public ResultCode OpenLibraryAppletProxy(ServiceCtx context)
+        {
+            MakeObject(context, new ILibraryAppletProxy(context.Request.HandleDesc.PId));
+
+            return ResultCode.Success;
+        }
     }
 }