Allow quick saving in rpg maker mv from the menu.

QuickSave.js

(() => {
    var quickSaveId = 1;

    Window_SavefileList.prototype.drawTitle = function(savefileId, x, y) {
        if (savefileId === 0) {
            this.drawText(TextManager.autosave, x, y, 180);
        } else if (savefileId === 1) {
            this.drawText('Quick Save', x, y, 180);
        } 
        else {
            this.drawText(TextManager.file + " " + (savefileId-1), x, y, 180);
        }
    };

    Scene_Menu.prototype.commandSave = function() {
    DataManager.saveGame(quickSaveId)
        .then(() => this.onSaveSuccess())
        .catch(() => this.onSaveFailure());
    };

    Scene_Menu.prototype.onSaveSuccess = function() {
        SoundManager.playSave();
        this.popScene();
    };

    Scene_Menu.prototype.onSaveFailure = function() {
        SoundManager.playBuzzer();
        this.activateListWindow();
    };
})();