Save an image at the end of the match

[WillB97]

Sorts out lighting for the image outside of the video.

https://user-images.githubusercontent.com/10937272/219864202-dfa0e357-9350-498a-9f9b-6dd90aefc82b.mp4

[PeterJCLaw]

Nice! Would be great to have some comments about how/why this works. I realise we don't quite understand ourselves, however I suspect that means it'll be even harder to understand in future. I think the important bits to capture are:

• cross link comments between the image capture and the lighting, so that the dependency is clear
• noting the nuances of the timing which are needed to get the behaviour we want out of Webots.