推荐：将NSDT场景编辑器加入你的3D工具链
3D工具集：NSDT简石数字孪生
扩展包的定义
扩展包需要在 package.json 文件里预先定义好所有功能以及一些基础信息，如下所示：
{
"package_version": 2,
"version": "1.0.0",
"name": "first-panel",
"tilte": "i18n:first-panel.title",
"description": "i18n:first-panel.description",
"author": "Cocos Creator",
"editor": ">=3.4.2",
"main": "./dist/main.js",
"dependencies": { ... },
"devDependencies": { ... },
"panels": { ... },
"contributions": {
},
"scripts": {
"build"
