Headless mode

[webdev03]

Originally suggested in https://scratch.mit.edu/users/god286/#comments-181494510

If a headless-cfg.json file is detected, then the application will automatically run with no inputs and read from headless-cfg.json. The file name may be decided later. Spec (WIP):

{
  "loader": {
    "pages": 3,
    "type": "profile",
    "specifier": "Z7Q"
  },
  "autoDelete": true,
  "silence": false,
  "verify": false
}

[webdev03]

working on it in a few days

[hello-smile6]

working on it in a few days

Finally! 🎉