do not attempt to load world on Folia servers

[Grabsky]

This operation is unsupported on Folia. We should instead refuse to load NPCs in worlds that were not loaded by the server initially.

Fixes #211

[Euphillya]

There is a possibility to make it work, just need to reimplement the NMS, example : https://github.com/Euphillya/Skyllia/blob/30005ff9c3563d61d40d498352208abfa5ea8990/nms/v1_21_R3/src/main/java/fr/euphyllia/skyllia/utils/nms/v1_21_R3/WorldNMS.java#L79

[Grabsky]

Not really a solution imo. We don't want to accidentally break someone's server or world because of that. Folia developers must have a valid reason for marking that operation as unsupported.

[Euphillya]

Not really a solution imo. We don't want to accidentally break someone's server or world because of that. Folia developers must have a valid reason for marking that operation as unsupported.

It is marked Not Supported because world loading is not currently possible. So they are temporarily disabled both loading and unloading worlds.

After disabling it is totally legit for now, I wanted to give the example as an indication

[OakLoaf]

I don't personally think FancyNPCs should be touching world loading at all in general. Aside from listening to the WorldLoadEvent