core: Keep track of ARPManager and register current application on boot

src/core/core.h

@@ -43,6 +43,10 @@ struct AppletFrontendSet;
 class AppletManager;
 } // namespace AM::Applets
 
+namespace Glue {
+class ARPManager;
+}
+
 namespace SM {
 class ServiceManager;
 } // namespace SM
@@ -288,6 +292,10 @@ public:
 
     const Reporter& GetReporter() const;
 
+    Service::Glue::ARPManager& GetARPManager();
+
+    const Service::Glue::ARPManager& GetARPManager() const;
+
 private:
     System();