File Thumbnails

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Implementing Thumbnails -- Note, that this would and should most likely be done after the asset manager's been implemented.

Now this is something that may already be implemented, but this is going to be an ever-changing task. Just adding this here as an idea/notes for writing thought process.

Since at the time of creating this issue, thumbnails have not been implemented yet.

Though having thumbnails would be great to have to showcase what kinds of assets are we viewing. Including loading, being stored, and being dragged into our asset manager.