Minor refactor and fix tests

[jonahpearl]

• Cleaned up test suite for new changes: all passing on my rig.
• Slightly re-factored camera.get_array() so that it always returns a tuple of the same length, but some of the items can be None if they aren't requested. AFAIK, this output never gets pickled directly, so there shouldn't be a major penalty to having a few extra values in the return.
• error handling during camera initialization: errors there will get printed instead of being silent.
• Fixed bug (pytest only??) where main thread would hang if display queues weren't empty at the end.
• Added a notebook (24-03-09_update_config) with an example of how to easily update a config. This also provides the updates I had to make to my config to get it working with the new camera params.

[jonahpearl]

• On any computer: pytest ./multicamera_acquisition/tests

  

• On a 6 cam rig with cameras and an MCU: pytest ./multicamera_acquisition/tests --camera_type basler_camera --runall

  

• On a 6 cam rig: run an acquisition notebook with a config that was previously known to work. If updates to the config are required, document them all and post the required changes in the PR for discussion.

These are the required changes from my config:

for camera_name, camera_info in config['cameras'].items():
    camera_info['gamma'] = 1
    camera_info['writer']["rc"] = "cbr"
    camera_info['writer']["bitrate"] = "10M"
    camera_info['writer']["max_video_frames"] = None
    if "writer_depth" in camera_info:
        camera_info['writer_depth']["max_video_frames"] = None