/hullhider hides the inside of the build area hull of a region from the
players who toggle it, like the hull hider of a fight. Each region gets its
own hull while somebody uses it; it is rebuilt every time somebody enables it,
as WorldEdit and Axiom changes do not update it. /techhider, /xray and
/hullhider exclude each other per player and region.
Which players may see the hull contents is now decided by Viewers, a sealed
class with HiddenByDefault (fight) and VisibleByDefault (bau). Added players
are stored in a set; isViewer alone defines what being added means.
The new TechHider registers a permanent global filter, so BauSystem now uses
a single BauTechHider that combines the hiding rules of the spectator
techhider, /techhider and /xray per player. To support the different
obfuscation blocks of these rules, ForPlayer now provides the obfuscation
block per position.
The ChunkHider now also checks single valued chunk sections, which were sent
unfiltered before, and recalculates their block count if they change.
Unhandled packet types are logged once; statistics, debug samples and ping
responses are passed through.
The legacy TechHider and its access widener entries are removed.
getBauMember never read its cache after the Exposed migration, so every
scoreboard render hit the DB (Too many connections, #479). Cache by
(bauwelt, member) incl. negative results, evict on addMember/remove, and
send BaumemberUpdatePacket to the Bauserver and all dev servers (also on
addmember). BauMemberUpdate clears the cache itself to not depend on
handler order.
Bundle piston order recalculations into one run every 200ms (wall clock,
independent of TPS) instead of one full recalculation and entity rebuild
per piston/place/break event. Tracked pistons that get moved are removed
from the visualization instead of being moved along.
Fixes#227
Numbering now comes directly from the vanilla resolver instead of a
custom breadth-first search, so the order matches the real move order
(including backtracking through slime/honey chains). The display of
more than 12 blocks is removed; a blocked piston is shown in red.
Refs: #158