[Plugins] Incorporated GNUsocialExtendedProfile as part of ExtendedProfile

Also improved a lot of the plugin and made things in a way it would make sense

plugins/ExtendedProfile/lib/profiletools.php

@@ -0,0 +1,52 @@
+<?php
+// This file is part of GNU social - https://www.gnu.org/software/social
+//
+// GNU social is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GNU social 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 Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Allows administrators to define additional profile fields for the users of a GNU social installation.
+ *
+ * @category  Widget
+ * @package   GNU social
+ * @author    Max Shinn <trombonechamp@gmail.com>
+ * @author    Diogo Cordeiro <diogo@fc.up.pt>
+ * @copyright 2011-2019 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
+
+defined('GNUSOCIAL') || die();
+
+function gnusocial_profile_merge(&$profile)
+{
+    $responses = GNUsocialProfileExtensionResponse::findResponsesByProfile($profile->id);
+    $profile->customfields = [];
+    foreach ($responses as $response) {
+        $title = $response->systemname;
+        $profile->$title = $response->value;
+        $profile->customfields[] = $title;
+    }
+}
+
+function gnusocial_field_systemname_validate($systemname)
+{
+    // Ensure it doesn't exist already
+    $fields = GNUsocialProfileExtensionField::allFields();
+    foreach ($fields as $field) {
+        if ($field->systemname == $systemname) {
+            return false;
+        }
+    }
+    // Ensure that it consist of only alphanumeric characters
+    return ctype_alnum($systemname);
+}