Drifter Tweak (Includes Shivers & Bowtorn too)

There are a lot of similar mods out there, but none that do things exactly how I wanted. So this is my version of modifying drifter spawns and looting.

Spawning:

• Max light level was reduced to 4.
  This makes it easier to spawn-proof underground areas.
  
  
• Spawn height was reduced to 0.9.
  From my experience, this guarantees they no longer spawn on the surface. I tried 0.95 and had quite a few pop up while exploring at night, presumably due to some shallow pits or something. I have roamed around over quite a distance on the surface at night with it set to 0.9 and haven't seen any yet.

Looting:

• Loot drops immediately, no butchering necessary.
• Corpses decay in 0.1 hours, so no cleanup necessary either.

Update for 1.20. Added all the same changes to the two new monsters.

Updated for 1.21. The folder path changed. The new rip looting added for falx doesn't seem to be compatible with the auto dropping loot thing, but auto dropping everything works better than the rip looting imho.