* Goes back to the settings state

* @param {Event} event

* Handles when the page got blurred

* @param {KeyboardEvent | MouseEvent} event

* @param {KeyboardEvent | MouseEvent} event

* Internal keydown handler * @param {object} param0 * @param {number} param0.keyCode * @param {boolean} param0.shift * @param

* Internal keydown handler * @param {object} param0 * @param {number} param0.keyCode * @param {boolean} param0.shift * @param

* Internal keyup handler * @param {object} param0 * @param {number} param0.keyCode * @param {boolean} param0.shift * @param {b

* Handles the given level completed * @param {number} level

* Handles a mouse move event * @param {MouseEvent} event

*

* Handles the given upgrade completed * @param {string} id * @param {number} level

* Handles a page visibility change event * @param {Event} event

@returns {boolean}

* Checks if achievements are supported in the current build * @returns {boolean} * @abstract

@returns {boolean}

* Checks if a given id is registered * @param {string} id * @returns {boolean}

* Checks if a given id is registered * @param {string} id * @returns {boolean}

@returns {boolean}

* Increases the tick rate marginally

@param {Achievement} achievement

@param {Achievement} achievement

@param {Achievement} achievement

* Should initialize the element, called *after* the elements have been created * @abstract

* Initializes the hud component

* Initializes everything