Rename App Methods

- renamed a lot of App methods to CamelCase
- replaced direct public variables with get-/set-Methods

src/Model/User.php

@@ -414,7 +414,7 @@ class User
 				$_SESSION['register'] = 1;
 				$_SESSION['openid'] = $openid_url;
 
-				$openid = new LightOpenID($a->get_hostname());
+				$openid = new LightOpenID($a->getHostName());
 				$openid->identity = $openid_url;
 				$openid->returnUrl = System::baseUrl() . '/openid';
 				$openid->required = ['namePerson/friendly', 'contact/email', 'namePerson'];