[CLEANUP] Cleaned up code

- Change variable $values to $settings in Route::setSettings method.
- Added return types to methods.
- Added type to method variables.
- Change ClassNotFoundException so required parameters are first.

src/Pecee/SimpleRouter/Route/IGroupRoute.php

@@ -29,7 +29,7 @@ interface IGroupRoute extends IRoute
      * @param array $handlers
      * @return static
      */
-    public function setExceptionHandlers(array $handlers);
+    public function setExceptionHandlers(array $handlers): self;
 
     /**
      * Get exception-handlers for group