* ServerUIPropertiesMenu for Configurator to edit builtin UIProperties of MP
* fixed unregister-functions of CallbackManager
* Reducing menuItemHeight in Configurator to avoid overlapping of the menu items
* Fully rebuild the admins menu after a player rights changed
* Added function to FileUtil to improve realpath, so symbolic links can be resolved
* Fixed indentation
* Update FileUtil.php
Fixed error in case of an absolute path on Unix-like systems.