* Alpha-sort cChestEntity
* Chests: use SendUpdateBlockEntity
* Pathfinder: fix out of range Y
* 1.13: correct weather packet ID
* Chests: fix neighbour scanner
+ Add OnAddToWorld and overload to scan neighbours there, instead of in the constructor/OnUse. This fixes hoppers accessing newly loaded double chests and seeing a null m_Neighbour, thus thinking its a single chest.
* Fix typo in cross coords computation.
* Simplify hopper logic.
* Block entities: ASSERT that type is correct
If you match the block type first before calling DoWithBlockEntity, the corresponding block entity must either be empty or correspond to the block type.
* Chunk: fix some forgotten PendingSendBE cleanup
+ Add cleanup in SetAllData, WriteBlockArea
- Remove RemoveBlockEntity (used once), HasBlockEntity (not used)
* Replace MakeIndex with MakeIndexNoCheck
* Remove extraneous MarkDirty in hopper & chests
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