Export and Import of applications

[rjahn]

It would be useful to export and import the custom applications from the overview. Simply add export and import menu items to the existing menu.

It should be possible to en/disable export and import via config parameter - json.
It's not possible to set the parameter on Java side because there's no communication between frontend and backend.
-> Default both options disabled

Only export custom applications or applications which can be changed?

[rjahn]

Unclear use-case. Why do we need an export/import.

Better would be a "share" feature.

It's already possible to show a QR code for an application. Another device could scan the code to "import" the application.
So it makes no sense to export/import an application.

The only use-case could be a "backup" / "restore" with an external service (local filesystem?), because if you uninstall/install the app, all your applications are gone.