微信小游戏分包加载demo

解决微信小游戏上传包时体积过大问题，使用egret分包加载，完美解决

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-06-20 02:13  subPackageDemo-master\
     文件          36  2018-06-20 02:13  subPackageDemo-master\.gitignore
     文件        1476  2018-06-20 02:13  subPackageDemo-master\README.md
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\.wing\
     文件         593  2018-06-20 02:13  subPackageDemo-master\subPackage\.wing\launch.json
     文件          76  2018-06-20 02:13  subPackageDemo-master\subPackage\.wing\settings.json
     文件         749  2018-06-20 02:13  subPackageDemo-master\subPackage\.wing\tasks.json
     文件         321  2018-06-20 02:13  subPackageDemo-master\subPackage\egretProperties.json
     文件        4286  2018-06-20 02:13  subPackageDemo-master\subPackage\favicon.ico
     文件        3340  2018-06-20 02:13  subPackageDemo-master\subPackage\index.html
     文件         331  2018-06-20 02:13  subPackageDemo-master\subPackage\manifest.json
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\assets\
     文件      139674  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\assets\bg.jpg
     文件        6777  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\assets\egret_icon.png
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\config\
     文件         231  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\config\description.json
     文件         347  2018-06-20 02:13  subPackageDemo-master\subPackage\resource\default.res.json
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\
     文件        9010  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\api.d.ts
     目录           0  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\bricks\
     文件        1882  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\bricks\bricks.ts
     文件        1272  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\config.android.ts
     文件        1072  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\config.bricks.ts
     文件        1265  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\config.ios.ts
     文件        3198  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\config.ts
     文件        2780  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\config.wxgame.ts
     文件         383  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\myplugin.ts
     文件      188322  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\node.d.ts
     文件        4505  2018-06-20 02:13  subPackageDemo-master\subPackage\scripts\tsconfig.json
............此处省略40个文件信息