Implement TUI for positions
Implement the TUI for positions (get and set).
If you run
python -m ceo, you'll see what the TUI looks like. Everything under members and groups has already been implemented.
When setting positions, there should be a Text field for each position, and the UI should automatically fill in those fields with the values of the current executives. You will need to make an HTTP request in a separate thread, and update the UI from that thread. See 'Add member' for an example.
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