Config-MMM keyhandler

/* jshint esversion:6 */

/**** Extending your module to work with MMM-KeyBindings *****
 *
 *  Use the code below in your module to accept key press
 *  events generated by the MMM-KeyBindings module.
 *
 *  These is a basic implementation, expand as needed.
 *
 */
var KeyHandler = Class.extend({
    /*** defaults ***
     *
     *   Default Key Binding Configuration, can be overwriten on init
     *
     */
    defaults: {
        /*** MMM-KeyBindings STANDARD MAPPING ***/
        /* Add the "mode" you would like to respond to */
        mode: "DEFAULT",
        map: {
            /* Add each key you want to respond to in the form:
             *      yourkeyName: "keyName_from_MMM-KeyBindings"
             */
            Right: "ArrowRight",
            Left: "ArrowLeft",
            /* ... */
        },

        /*** OPTIONAL ***/
        /*  When using muliple instances (i.e. the screen connected
         *  to the server & browser windows on other computers):
         *
         *  multiInstance: true -- the bluetooth device will only
         *  control the local server's instance.
         *  The browswer windows are controlled by the local
         *   keyboard (assuming enableMoustrap:true in
         *   MMM-KeyBindings' config)
         *
         *  multiInstance: false -- the bluetooth device will
         *  control all instances of this module.
         *
         */
        multiInstance: true,

        /* If you would like your module to "take focus" when a
         * particular key is pressed change the mode
         * setting to "MYKEYWORD" and add a "takeFocus"
         * mapped to a key. This will keep other modules
         * from responding to key presses when you have focus.
         *
         * Just remember you must release focus when done!
         * Call this.releaseFocus()
         * when you're ready to release the focus.
         *
         * Additional Option:
         * For complex setups you can also set an "external interrupt"
         * in the MMM-KeyBindings config which can set the mode
         * without first sending a keypress to all modules
         *
         * Example below takes the focus when "Enter" is pressed
         *
         */
        takeFocus: "Enter",
        /* OR AS AN OBJECT: */
        // takeFocus: { keyName: "Enter", keyState: "KEY_LONGPRESSED" }
        debug: false,
    },

    /* init()
     * Is called when the module is instantiated.
     */
    init: function(name, config) {