Vent Spawn Fix

On its own, this mod does nothing. This just adds support for indoor enemies to spawn in groups of 2 or more, similar to baboon hawks (outside) and tulip snakes (daytime).

This was previously used by the Barber (which was meant to spawn in pairs in v55), but in v62+ Barbers are configured to spawn alone.

This mod is meant to be paired with BarberFixes using the SpawnInPairs config setting, but it will also work with any content variable customizer, such as LethalQuantities or similar.