Add follow shortcut support and option to disable it if needed

[eXhumer]

Add check for "mimeType": "application/vnd.google-apps.shortcut". Then check if user wants to follow shortcut or not. If not follow shortcut, skip it. If follow shortcut, check the target details for shortcut. and do stuff again based on that and so on.

Add shortcutDetails(targetId,targetMimeType) to get request to get the shortcutDetails. It looks like this.

 "shortcutDetails": {
  "targetId": "1SqcsGNkkd****************",
  "targetMimeType": "application/vnd.google-apps.folder"
 }