Change output structure of "kpm pack"

- global.json and packages folder goes to approot
- Main project & project dependencies go to approot\src
- Extract static files from main project into public app folder
- Generate k.ini which contains APP_BASE

parent #422 
`binFolderPath` is `approot\src\MainProject\bin`, while `appFolderBinPath` is `wwwroot\bin`. `approot` and `wwwroot` are siblings.