If Set Npc Head Active
If set-npc-head-active is used to set a npc's chathead on an interface, commonly in dialogues. Rather than taking the id of the npc config, this function takes the index of the npc in the world. Npc's model is looked up from the client through npc info, allowing for the chatbox to render a custom-built npc with completely dynamic models, rather than the pre-defined configs.