Save single-light images to a subfolder of the capture

[mrozycki]

With the -s option in the configurator, we save a lot of files into a single folder. This means that finding the (generally more useful) aggregate files (e.g. 2D coordinates CSV file) in a sea of single-light images is not very convenient.

Instead the files should be stored like this:

* 2022-12-05T19:24:07/
    * single-lights/
        * 000.jpg
        * ...
    * front.csv
    * reference.jpg

This will make it much easier to find the aggregate results while also giving the option to access single light files when needed.