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This actually includes functionality for dragging and dropping into the topics as well as deleting papers from the topics.

Deleting topics involves clicking an 'x' button next to the topic id. The app does not ask the user to confirm deletion since it'll take a long time for them to delete a bunch of papers.

The code is getting long winded...I'll refactor it after i'm done with all the topics features so the that scope uses a set for the list of papers rather than a list.