/**
 * Returns the main instance of wp_macro_calculator_plugin to prevent the need to use globals.
 *
 * @since  1.0.0
 * @return object wp_macro_calculator_plugin
 */
function wp_macro_calculator_plugin()
{
    $instance = wp_macro_calculator_plugin::instance(__FILE__, '1.0.0');
    if (is_null($instance->settings)) {
        $instance->settings = wp_macro_calculator_plugin_Settings::instance($instance);
    }
    return $instance;
}