feat: backup and restore settings

[pedrolamas]

Add a new Backup and Restore buttons to easily export and import Fluidd settings across multiple printers.

As a first implementation, this will backup/restore ALL Fluidd settings (there is no selections of specific parts of the settings).

Resolve #1113

[pedrolamas]

I like the idea of adding the version to it, that makes complete sense to me!

Confirming if it is a Fluidd backup or not is tricky, as this is just a JSON file... granted we could have some schema to check against but that makes versioning very tricky!

[matmen]

Well, using a fluidd key we could at least check if that's there - not a high chance a random json file will have one ;) No need to validate the entire schema IMO

[pedrolamas]

Well, using a fluidd key we could at least check if that's there - not a high chance a random json file will have one ;) No need to validate the entire schema IMO

Agreed! 🙂

[pedrolamas]

Following the comments, I made output filename is now "backupfluidd_.json"

The JSON blob is now using this format:

{
  "meta": {
    "app": "Fluidd",
    "version": "1.2.3",
    "type": "settings-backup"
  },
  "data": {}
}

We will verify that meta.app === 'Fluidd' and that meta.type === 'settings-backup' so that we can match the expected format!

Should be enough to validate the expected format and that version will allow us flexibility in the future if we want to!

[Escrich]

Good Job!, great job!