[Feature] Create a command that runs camera setup again

[giggio]

If you change your camera, or plug it into a different USB device, you'll get the error:

Camera path is not configured correctly, please edit the 'device_path' config value.

I suggest a new command for that: howdy setup (or any other verb, I don't care about the verb).

It would be nice to run the setup that finds the camera again, it is much simpler than looking through the device path with ls -l /dev/v4l/by-path/, as suggested in #533 (comment).

I am aware, from the comment on #767 (comment) that we can find the setup scripts here, but it is also not as easy to do.