Generate ERP figures after bcipy sessions

[tab-cmd]

Overview

Added a visualize_session_data method to helpers/visualization.py. This method is now used in main.py with the boolean visualize on bci_main. This results in an ERP image generated after each session (fake, calibration, copy phrase, etc.). It will fail to generate an image if no target or nontarget labels are found.

Ticket

Ticket

Contributions

• helpers/visualization.py: new method visualize_session_data that leverages the existing visualize_erp function.
• offline_analysis.py: by default, do not save the figures after training; assume this will happen after a session. This is helpful to know what channels etc., to include before training.
• main.py: update bci_main to include a visualize boolean. Using the new visualize_session_data method, an ERP image is generated and saved to the session folder.

Test

• Make test-all
• Make integration-test
• Run bcipy and ensure figures generate after the session.

Documentation

• Are documentation updates required? In-line, README, or documentation? Updated docstrings where appropriate.

Changelog

• Is the CHANGELOG.md updated with your detailed changes? Yes!