aMember (site.php): Ability to clear invoice log from admin interface

site.php

<?php

/**
 * Add new item to aMember CP -> Utilities -> Delete Old Records
 */

Am_Di::getInstance()->hook->add(Am_Event::CLEAR_ITEMS, function(Am_Event $e) {

    $di = $e->getDi();
    $e->addReturn([
        'method' => function ($date) use ($di) {
            $di->invoiceLogTable->deleteBy([['tm', '<', $date]]);
        },
        'title'  => 'Invoice Log',
        'desc'   => 'invoice log table (used by admin only)'
    ], 'invoice_log');

});