Add settings based on player distance

[Lexicality]

• Turn off if there are no players within X units
  • Delete all NPCs when turned off
• Turn off when a player comes within Y units
  • Try to re-spawn removed NPCs when retriggered
• Make all NPCs target the nearest player
  • Add clamp as to "nearest" (maybe?)

[Lexicality]

Setting wakeradius would be a handy standin too