Sublime设置关闭（保存）所有文件快速键 close all files

[
    { "keys": ["alt+d"], "command": "close_all" }, // 关闭所有文件
    { "keys": ["alt+s"], "command": "save_all" }, // 保存所有文件
]

参考文档
1、https://forum.sublimetext.com/t/cannot-bind-keys-to-close-all-files/8254/4