due to the extremely large performance cost of instantiating AsyncTasks, it's usually not worth bothering with async compression except for very large packets.
While this large overhead can be significantly reduced by using specialized threads, it's early days in the testing stages for such improvements, and for now, we still have this to deal with.
Since async compression is always used prior to player spawn, this change may slightly improve the performance of the pre-join stage of the game.
WARNING: This WILL have a performance impact on larger servers, but that's the price to pay for having crops actually grow.
The old overengineered method for doing this was causing glacially slow crop growth, vanilla parity issues and really just didn't make much sense. This method is probably incorrect too, but it will at least produce visible results.
preset is now supported as its own key, and it's less confusing to present it separately, since that's how it's displayed in the server.properties also.
this makes it much easier to observe and debug stuff that depends on it, such as grass, crop and tree growth, since they'll happen much faster.
A future improvement would be to have the update function use a non-global random so that the output can be reproduced using a given seed.
