MDL-79844 core_ltix: create admin settings node

This change:
- adds category to top, so it'll appear under 'General' tab.
- creates a single 'manage tools' external settings page in that
category
- adds support for ltixsource plugin settings to be included inside
that category

admin/settings/ltix.php

@@ -0,0 +1,36 @@
+<?php
+// This file is part of 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/>.
+
+/**
+ * LTI settings.
+ *
+ * @package    core_ltix
+ * @copyright  2024 Jake Dallimore <jrhdallimore@gmail.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+// Tool configure page, sitting under 'ltix' category.
+$toolconfigurepage = new admin_externalpage('ltixtoolconfigure', get_string('manage_external_tools', 'core_ltix'),
+    new moodle_url('/ltix/toolconfigure.php'));
+$ADMIN->add('ltix', $toolconfigurepage);
+
+// Also include any ltixsource plugin settings under this same category.
+foreach (core_plugin_manager::instance()->get_plugins_of_type('ltixsource') as $plugin) {
+    /** @var \core\plugininfo\ltixsource $plugin */
+    $plugin->load_settings($ADMIN, 'ltix', $hassiteconfig);
+}

admin/settings/top.php

@@ -35,6 +35,7 @@
 $ADMIN->add('root', new admin_category('competencies', new lang_string('competencies', 'core_competency')));
 $ADMIN->add('root', new admin_category('badges', new lang_string('badges'), empty($CFG->enablebadges)));
 $ADMIN->add('root', new admin_category('h5p', new lang_string('h5p', 'core_h5p')));
+$ADMIN->add('root', new admin_category('ltix', new lang_string('ltix', 'core_ltix')));
 $ADMIN->add('root', new admin_category('license', new lang_string('license')));
 $ADMIN->add('root', new admin_category('location', new lang_string('location','admin')));
 $ADMIN->add('root', new admin_category('language', new lang_string('language')));