Fixed gh-565 by removing the old PHPExcel_IOFactory and adding the new. Updated the subform layout for verious subforms in JCB for beter display. Change the helper category naming conventions for better integration with Joomla fields. gh-561

site/helpers/categoryfield.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * @package    Joomla.Component.Builder
+ *
+ * @created    30th April, 2015
+ * @author     Llewellyn van der Merwe <http://www.joomlacomponentbuilder.com>
+ * @github     Joomla Component Builder <https://github.com/vdm-io/Joomla-Component-Builder>
+ * @copyright  Copyright (C) 2015 - 2020 Vast Development Method. All rights reserved.
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+// No direct access to this file
+defined('_JEXEC') or die('Restricted access');
+
+/**
+ * Componentbuilder Field Component Category Tree
+ */
+class ComponentbuilderFieldCategories extends JCategories
+{
+	/**
+	 * Class constructor
+	 *
+	 * @param   array  $options  Array of options
+	 *
+	 */
+	public function __construct($options = array())
+	{
+		$options['table'] = '#__componentbuilder_field';
+		$options['extension'] = 'com_componentbuilder.field';
+
+		parent::__construct($options);
+	}
+}