Add "Separate Windows" LayoutOption (#6177)

src/input_common/main.cpp

@@ -56,6 +56,7 @@ void Shutdown() {
     Input::UnregisterFactory<Input::AnalogDevice>("analog_from_button");
     Input::UnregisterFactory<Input::MotionDevice>("motion_emu");
     motion_emu.reset();
+    Input::UnregisterFactory<Input::TouchDevice>("emu_window");
     Input::UnregisterFactory<Input::TouchDevice>("touch_from_button");
     sdl.reset();
     udp.reset();