Enigma: Add positiblity to modify list of identities for key generation by other plugins

plugins/enigma/lib/enigma_ui.php

@@ -721,7 +721,11 @@ class enigma_ui
         // get user's identities
         $identities = $this->rc->user->list_identities(null, true);
         $checkbox   = new html_checkbox(array('name' => 'identity[]'));
-        foreach ((array) $identities as $idx => $ident) {
+
+        $plugin     = $this->rc->plugins->exec_hook('enigma_user_identities', array('identities' => $identities));
+        $identities = $plugin['identities'];
+
+        foreach ($identities as $idx => $ident) {
             $name = empty($ident['name']) ? ($ident['email']) : $ident['ident'];
             $attr = array('value' => $idx, 'data-name' => $ident['name'], 'data-email' => $ident['email']);
             $identities[$idx] = html::label(null, $checkbox->show($idx, $attr) . rcube::Q($name));