Pier 26.40.0

Built for BDS 1.26.40 and LeviLamina 26.40.0. A release is built against the one BDS its
number names, so 26.32.2 stays the build for BDS 1.26.32 and does not run on 1.26.40.
The engine changes are small and none of them reaches the ABI: PIER_ABI_VERSION stays
at 2 and a mod built against 26.32.2 keeps working without a rebuild.

Changed

• Custom dimension registration carries a pack id.
  DimensionManager::_registerCustomDimensionWithDimensionDefinitionGroup takes a third
  argument in 26.40, the resource pack a definition came from, and
  DimensionDefinitionGroup::DimensionDefinition gained the matching mPackId. A Pier
  dimension comes from no pack and registers with a zero UUID.
• The scoreboard packet became a payload packet. SetScorePacket derives from
  ll::PayloadPacket<SetScorePacketPayload>, its mType is gone, and a row is one
  alternative of std::variant<RemoveScore, ChangePlayerScore, ChangeEntityScore, ChangeFakePlayerScore> instead of a ScorePacketInfo with an identity type field. The
  sidebar builds ChangeFakePlayerScore rows, which is what the identity field said.
• Player::startSleepInBed takes setsRespawn and sleepOffset, and the sleep hook
  passes both through unchanged.
• DedicatedServer::runDedicatedServerLoop returns ::ServerExitCode rather than a
  nested one and takes an EditorAllowList; the client-side-generation hook follows.
• DimensionDataPacket, LevelChunkPacket and SubChunkPacket are payload packets,
  so their fields are inherited and $write has two overloads. The chunk trace names the
  one-argument overload explicitly. LevelChunkPacket no longer carries
  mClientNeedsToRequestSubchunks: a set mClientRequestSubChunkLimit is the request,
  and the trace reports it that way.
• NetworkChunkPublisher::moveRegion is gone, and every other entry point of that
  class carrying a region sits behind LL_PLAT_C, so none of them is declared on a
  server build. The send-region trace reads mLastChunkUpdatePosition and
  mLastChunkUpdateRadius from inside the queued-chunk hook instead, and reports the
  region when it changes rather than on every call.
• MobEffectInstance has no constructor of its own. Adding an effect builds the
  instance empty and assigns the id, duration, amplifier and visibility, which is what
  the removed two-argument constructor did.

Removed

• PIER_BPROP_IS_DOOR and PIER_BPROP_IS_STAIR are unsupported.
  BlockType::isDoorBlock and isStairBlock are gone in 26.40 and nothing replaces
  them; a block tag would be a guess at the name the engine files carry.
• PIER_APROP_IS_IN_LOVE is unsupported. Actor::isInLove is gone in 26.40 and
  nothing replaces it. The mInLovePartner field survives, and reading it would be a
  guess at what the accessor tested, so the property is reported as unsupported rather
  than answered with a value that may be wrong.