Check for NoDisplay=true in .desktop

[cassidyjames]

We currently require this since the applications launcher is where users go to see their apps. We might remove this requirement at a later date if we figure out a better story around these types of apps, but we've been enforcing it for now.

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[cassidyjames]

So the issue to file against apps should be a little something like this peteruithoven/resizer#15

We might also want to mention that their app needs to properly handle opening from the .desktop file (i.e. without any files or extra arguments passed to it) so that it behaves as expected when users open it from the applications menu (which is what the bug #1 was that I linked to in that issue).

[danirabbit]

Probably worth checking if flatpak builder allows nodisplay desktop files