- TickerCoordinator.pendingChanges is now a HashSet
- TickerCoordinator now makes some best-effort checks to make sure the
world does not change during evaluation phase
- Extracted Cached{Block,Tile}Change
- these classes implement hashCode() and equals() based on the
location of the block/tile they affect, thus ensuring that only one per
block/tile remain in the aforementioned set
- Similarly extracted PacketAffect{Block,Tile,Entity}
- Renamed a bunch of packets