Settings and preferences import/export CLI

[kdeldycke]

Is your feature request related to a problem? Please describe.

Since #159 & #119, we can export and import iGlance settings by the way of a JSON file. That's a great feature which is working well!

Now I'd like to script the loading of these settings, so I can automate even more the deployment of my dotfiles.

Describe the solution you'd like

I'd like to have the option of starting/invoking iGlance with a CLI to load up defaults settings.

Something in the spirit of:

$ /Applications/iGlance.app --import-settings ~/dotfiles/assets/iglance-settings.json

Describe alternatives you've considered

I tried to tweak settings via the preferences plist file (located ~/Library/Preferences/io.github.iglance.iGlance.plist).

But it seems user settings are somewhat serialized binary format (is that JSON?):

$ defaults read io.github.iglance.iGlance
{
    SUHasLaunchedBefore = 1;
    SULastCheckTime = "2020-12-29 12:22:59 +0000";
    iGlanceUserSettings = {length = 985, bytes = 0x62706c69 73743030 da010203 04050607 ... 00000000 00000311 };
}

[kdeldycke]

For reference, this is related to: #142

[kdeldycke]

For inspiration, I'd like to point to Aerial (an open-source Swift project), which managed to persist all its settings in a JSON serialized string. I guess there is some good code/practice in its code to follow. See the discussion at JohnCoates/Aerial#976 to get a good understanding of this issue.