Refactor contact management functions and remove phpinfo.php

- Updated formatting and structure of functions in edit_contact.inc.php for better readability and consistency.
- Added comments to clarify the purpose of certain code sections, especially regarding mandant handling.
- Removed the deprecated phpinfo.php file to clean up the codebase.

mysyde/common/classes/Adminmenu.php

@@ -244,6 +244,12 @@ class Adminmenu {
                     'include'      => MODULE_PATH . "ticketcenter/ticketcenter.inc.php",
                     'linklistmenu' => TRUE,
                     'subsites'     => array(
+                        // 'settings'      => array(
+                        //     'name'         => $translation->get('Einstelungen'),
+                        //     'include'               => MODULE_PATH . "ticketcenter/views/settings/settings.inc.php",
+                        //     'admin_start_parameter' => "",
+                        //     'linklistmenu' => TRUE
+                        // ),
                         'category'      => array(
                             'name'         => $translation->get('category'),
                             'include'               => MODULE_PATH . "ticketcenter/views/category/category.inc.php",