LibGUI+WindowServer: Add a SystemEffects wrapper and helpers

SystemEffects provides a tidy way to work with system-wide
visual options passed through IPC.

Userland/Libraries/LibGUI/SystemEffects.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <Services/WindowServer/SystemEffects.h>
+
+namespace GUI {
+
+using SystemEffects = WindowServer::SystemEffects;
+using ShowGeometry = WindowServer::ShowGeometry;
+using Effects = WindowServer::Effects;
+
+}