Python task manager from scratch, part 35: Listing tasks from the command line

I value quick access to my tasks list. Because the display and storage of tasks are separate, we can implement several methods for displaying the same tasks.

More specifically, I want to interact with my tasks from the command line, both for its own sake and because it might later be useful to integrate with other command-line utilities. So, I:

1. Wrote a script to list the current tasks;
2. Modified my .bash_aliases to include a shortcut to python3 list_tasks.py. (This is optional!)

Here's the current commit in the veery/ repository.