code refactoring, class name changes, init

Classes are now initialized automatically in core/init.php. You no
longer need to create for example "$auth = new AuthorizationService".
You can just access the $authorizationService from init.php. You only
need to initialize new classes if you are working inside a class.
Some code styling done!
Classes renamed to: Provider if it provides any data. Service if it
mainly manipulates any data.