[feature request] Add the ability to save NPC configurations for each world in the world folder

[iamkoldun]

Hello! We have created a custom backup system for our build server, but we’ve encountered an issue: FancyNpcs stores all the data about NPCs in the plugins/FancyNpcs/npcs.yml file. As a result, we have to write scripts to dynamically populate this file when restoring worlds.

It would be very convenient to have a feature flag that allows toggling the storage method for NPCs, with an option to store them directly in the world directory.

Thanks!

[Grabsky]

Plugins are not supposed to store anything outside of their data folder under plugins directory and current system responsible for data saving/loading is not designed in a way that would allow to easily split npcs.yml file per world.