function keyCodeFromKey( key ) {
	let keyCode = keys.find( keyCode => keyFromKeyCode[ keyCode ] === key );
	if ( !keyCode ) {
		const keyLC = key.toLowerCase();
		keyCode = keys.find( keyCode => keyFromKeyCode[ keyCode ] === keyLC );
	}

	return parseInt( keyCode );
}
Infers the keycode from the given key
@param {string} key The KeyboardEvent#key string
@returns {number} The keycode for the given key