额外资源位置：
    打包前：项目根目录

    1. electron-egg/build/extraResources


    打包后：软件安装目录

    1. # windows (例子)
    2. D:\test\ee\resources\extraResources
    4. # macOS (例子)
    5. /Applications/ee.app/Contents/Resources/extraResources
    7. # Linux (例子)
    8. ...