Fixes most 'abnormal' lag caused by processing subsystems. #4538
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About The Pull Request
Reverts #2271
This has done wonders with removing most serverside lag on my local.
#4537 is still relevant. There absolutely should be fewer processing machines but at least we are now processing in linear time again. We still can't manage to process all machines in a single tick (and we likely never will) but it's faster and doesn't lag anymore.
This conflicts with #4535, but is also safer and higher priority.
I was wrong about this being the reason why SSmachines initializes slow, that has to do with atmos machines.
Details
The old implementation was pretty stupid if you know how lists are implemented.