Create a thumbnailer for .akira files

[Philip-Scott]

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.

https://github.com/Philip-Scott/Spice-up/pull/121

[Alecaddd]

Yes, I agree that this is a pretty important aspect of the .akira file format. Is this part of the work you're doing on #110 ?

[Philip-Scott]

Not on that PR for sure, but it will help to get it working :) That way we can store a thumbnail inside the zipped file instead of having to process the whole file when it's thumbnail is requested