Introduced customisable elements to the customcert

Elements are sub-plugins that have the same abilities as a core plugin, such as creating tables, capabilities and performing upgrades.

Currently elements can define -

* What additional form elements are rendered when adding the element to the customcert customisation page.
* How the data from the additional form elements is validated and saved.
* How the element is rendered on the PDF.
* How the element handles removing data when it is deleted.

elements/studentname/lang/en/customcertelement_studentname.php

@@ -0,0 +1,26 @@
+<?php
+
+// This file is part of the customcert module for Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Strings for component 'customcertelement_studentname', language 'en'.
+ *
+ * @package    customcertelement_studentname
+ * @copyright  Mark Nelson <markn@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+$string['pluginname'] = 'Student name';