Prevent users from creating shortcuts / adding to Steam if AppImage

[arielj]

Problem description

Currently, the AppImage distributable of Heroic cannot register itself as a protocol handler in the system, so shortcuts and games added to Steam won't work.

Games are added, and shortcuts are created, but then it silently fails for the users.

Feature description

If we can detect Heroic is running as an AppImage, we can change how the add to steam and add shortcuts actions work. Instead of performing those actions, we can say the features don't work with the AppImage.

Alternatives

An alternative is to hide the actions, but that will make users more confused not knowing why they don't have those actions and will create another source of reports.

Additional information

I don't know if the AppImage not registering itself can be solved, that would be the best solution, but I don't know if it's even possible so having the information displayed to the user can help while a solution is found.