Do not allow file delete operation from mobile

[saberraz]

There are several ways that a project can get corrupted on the device: antivirus, lack of storage, bad internet connection...
By default we should not allow delete file operation from the mobile app. It could be a setting that enables that, if want to give the option. But generally, this should not be allowed.

For good measures, we should also block uploading of the Geopackage if it is non-geodiff-able from the app for the same reasons above (corrupted file).

[tomasMizera]

This is essentially what the editor permission will fix, right?

[saberraz]

Partially yes, but it should be disabled also for admins.