Task List

[rdrpenguin04]

Fixes #299

This creates a list of tasks that can be added, deleted, completed, and uncompleted. Moving tasks around with arrows is a stretch goal for this PR and is somewhat less likely (but not impossible; I have a plan™); moving tasks around by dragging is a hard pass for the moment.

TODO:

• [x] Create basic task struct
• [ ] Delete tasks
• [ ] Create new tasks
• [ ] Render subtasks
  • They're already rendered in some capacity, but we want to do it better
  • This does not include creating subtasks necessarily

[rdrpenguin04]

I'm going to abandon this PR in favor of things the MVP needs; if anyone wants to pick this up later they can