Everywhere: Move the Ladybird folder to UI

UI/Qt/EventLoopImplementationQtEventTarget.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2023, Gregory Bertilson <zaggy1024@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <UI/Qt/EventLoopImplementationQtEventTarget.h>
+
+namespace Ladybird {
+
+bool EventLoopImplementationQtEventTarget::event(QEvent* event)
+{
+    return EventLoopManagerQt::event_target_received_event({}, event);
+}
+
+}