A simple json patch to make drifter swarms lesser for caving.

Mod reduces most drifter max group sizes by a few, default drifers from 14->10, deep from 8->6, and the rest only reduced by 1 to keep difficulty scaling as you go deeper.

Also reduces the MinLightLevel for spawning drifters from 9->4 to make torches and oil lamps a bit more substantial for caving to prevent spawns without altering the amount of light they put out.

This mod will not prevent drifters from spawning on the surface at night or during storms, those behaivors are unchanged. 

First mod - will be updated and tweaked accordingly as I run through it on my own playthrough until it feels right.

Should work through updates as its only a .json patch unless they change the Drifter.json file itself.