Triggered after an item is removed from the shopping cart.
Usage example:
public function subscribeEvents()
{
Backend::$events->addEvent('shop:onAfterRemoveFromCart', $this, 'after_remove');
}
public function after_remove($cart_name, $key)
{
$item = Shop_Cart::find_item($key, $cart_name);
if ($item)
traceLog('Removed '.$item->product->name);
}