Again, sorry for the huge commit. Just taking on performance issues as I
see them. Changes in this:
- Deadlocks in region code finally fixed
- Chunk packet preparation optimized (saves ~10-20ms per packet, since
we're sending these like 30 at a time that's pretty important) by
storing chunks pre-encoded in memory (basically just using a single
big array for IDs, metadata, and light)
- Move chunk generation and compression to the thread pool
- Move client chunk updates to the scheduler
- Improve profiler coverage
- Add knob to disable scheduling chunk events on chunk load
- Make it possible to disable specific scheduled events in config.yml
