Add option to delay file creation to world load

[Gregor0410]

When enabled, all files apart from poi region files are not created until the player joins the world. If there are no pois generated before the seed is reset, then the world folder will never be created.
On my machine, enabling the option results in a slight RPS increase

[contariaa]

The world files are (unfortunately) currently required for verification.
I have a local (but quite outdated) proof-of-concept branch that works quite similarly to this PR, if I'm understanding my old code correctly i delayed creating the POI storage worker creation, although I had some issues with fastreset compatibility.
I've brought up the idea to remove the requirement for seedqueue world files in discussion about mcsr-fairplay and Exer suggested having it save information to a seperate file that only gets updated on world join. However this is probably not gonna be in the initial release version of mcsr-fairplay