Fix snapshots/rendering

[kitskub]

Right now, FPS is very low (compared to Client). This is caused by two things:

1. We're generating/displaying a lot more chunks than Client.
2. Many chunks are missing neighbors when meshing, so extra faces are generated.

2 is probably caused by the snapshot system.
We need to make sure that the order of everything is:
(Load/gen chunks -> snapshot) all chunks in visible range -> mesh

Although, we would still have to worry about what happens when we move: chunks are (should be) remeshed when a neighbor updates. However, this should not cause the chunk itself to "update."

[Wolf480pl]

I'd love to see this done. Too bad I have little understanding how this stuff works in flow-engine.

[kitskub]

Much work on this has been done in https://github.com/flow/flow-engine/tree/clientrefactor

Newly generated chunks are still messed up and need work

[kitskub]

Issue has been visually resolved in: 2e37686

However, I need to look into meshing again. What I fixed (changing the generator) should not have made the chunk meshing/renderer go wacky.