Function rs::main::c::register_ui_loop_handler

#[no_mangle]
pub extern "C" fn register_ui_loop_handler(
    receiver: Wrapped<Receiver<Commands>>, 
    panel_manager: PanelManager, 
    popover: Actor, 
    hint_manager: HintManager, 
    dbus_handler: *const DBusHandler
)

Places the UI loop callback in the glib main loop.