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Description
Expected Behavior
Akira files should show a thumbnail on file browsers of the available file.
Possible Solution
I once played with the idea of having Spice-Up show thumbnails of the file. I had it working on the Gnome File browser but it was not working on the elementary browser. But basically we just need to make the Application class have a cli arg that creates a thumbnail from the file. It's simpler if we can store a thumbnail inside the .akira zipped file while saving and just use that instead.