Minor bugs fixing

When a folder is set as budget, a gray [B] icon will appear next to the total. If the [B] is lighter, it means that a folder inside the current one has the "budget" setting active. Please check the help inside the app for more details.

We also corrected a visual bug with backup export to Files (thanks Celilia).

- Items and folders can now be duplicated.
- New backup and restore function, to export a safe copy of your data.

- iPhone X ready.
- Enhancements in protected items.