Allow to adjust the saturation and colour of Night Vision Effect

Either Controlled through Mod.json

Or by making the night vision a statistic with a colour and saturation setting

(eg set "LV_NIGHT_VISION_#7CFC00_4 for a strong green with a mediocre saturation, im sure you can do my idea better)

The issue names no files, tests, or entry points to begin with. First clarify whether the setting belongs in Mod.json or in a statistic, including the intended colour and saturation format. Done means Night Vision Effect settings can be configured and the resulting colour and saturation match the documented behaviour.

Written by the indexing model from the issue text.