Add an option to disable area tints, return to the much better original lighting

The tints in most areas in the PTB branch of Gondwa are far too strong, even after tuning down some of them. The worst offenders are Dark woods, which looks bleached to the point it hurts my eyes, and sharptooth/birchwood, which look like someone dumped a bucket of algae on my dinos, and makes me nauseous, and ruin the original feel.

Given that the natural lighting was amazing to begin with, I'd like to see an option to disable tints and return to the much better original lighting, if not get rid of tints altogether.

Please consider this.