Now infinite, with better performance!

The demo should now infinitely generate more world as you explore.

There are still various performance and graphical issues that I, sadly, don't have time to dive into right now, but I'll be fixing in the future.

There are also now separate threads for deleting and adding nodes to the world, so loading is less of a visual performance hit. This brought some weird async issues which is where I think some of the new performance issues come from, but I'll be exploring and fixing those when I am able to work on this more.

Please consider supporting me so I can make more projects and more code examples like this one!