Add some new hooks for the account/create page

Also moved some account-create text to plugins

plugins/account-create-hint/hint.html.twig

@@ -0,0 +1,3 @@
+To play on {{ config.lua.serverName }} you need an account.
+All you have to do to create your new account is to enter an account {% if constant('USE_ACCOUNT_NAME') %}name{% else %}number{% endif %}, password{% if config.recaptcha_enabled %}, confirm reCAPTCHA{% endif %}{% if config.account_country %}, country{% endif %} and your email address.
+Also you have to agree to the terms presented below. If you have done so, your account {% if constant('USE_ACCOUNT_NAME') %}name{% else %}number{% endif %} will be shown on the following page and your account password will be sent to your email address along with further instructions. If you do not receive the email with your password, please check your spam filter.<br/><br/>

plugins/account-create-hint/hint.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * account-create index.php
+ *
+ * @package   MyAAC
+ * @author    Slawkens <slawkens@gmail.com>
+ * @copyright 2020 MyAAC
+ * @link      https://my-aac.org
+ */
+defined('MYAAC') or die('Direct access not allowed!');
+
+global $twig_loader;
+$twig_loader->prependPath(BASE . 'plugins/account-create');
+
+$twig->display('hint.html.twig');