Implement World (un)load API

[kyngs]

Is your feature request related to a problem?

Yes, I need to load worlds on startup from my plugin

Describe the solution you'd like.

Implement the current Bukkit API instead of throwing an exception

Describe alternatives you've considered.

• Patch folia and hardcode the worlds I need
• Not to use folia

Other

Thre's been a PR on this subject, but it was closed. I didn't find any issue tracking this matter.

[KonusIntelliJ]

I'm waiting too a fix world API create/load

[maglink]

So, I'd uncommented "load world" function and it works perfectly. But I'm using it only on server startup. May be problems if use it during the game.

[kaxlabs]

Uncommenting load world function probably works during startup. I use https://github.com/Folia-Inquisitors/MoreFoWorld

[kyngs]

At least as a temporary solution, the world API should only be available from the start. The absence of this is still holding many plugins from moving to Folia.