Implement world cache to monitor expeditions

This implements a small cache in world to track expedition states.

This fixes expired expeditions being left in zone caches unless the
expedition's dz instance was running to detect it (or unless an
expedition was deleted via a client using /kickplayers). This was also
leaving clients in a ghost expedition that no longer actually existed

common/ruletypes.h

@@ -791,6 +791,7 @@ RULE_BOOL(Expedition, UseDatabaseToVerifyLeaderCommands, false, "Use database in
 RULE_BOOL(Expedition, EmptyDzShutdownEnabled, true, "Enable early instance shutdown after last member of expedition removed")
 RULE_INT(Expedition, EmptyDzShutdownDelaySeconds, 900, "Seconds to set dynamic zone instance expiration if early shutdown enabled")
 RULE_INT(Expedition, RequestExpiredLockoutLeewaySeconds, 60, "Seconds remaining on lockout to count as expired for creation requests (client hides timers under 60s remaining)")
+RULE_INT(Expedition, WorldExpeditionProcessRateMS, 6000, "Timer interval (ms) that world checks expedition states")
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(DynamicZone)

common/servertalk.h

@@ -159,6 +159,7 @@
 #define ServerOP_ExpeditionRequestInvite      0x040f
 #define ServerOP_ExpeditionReplayOnJoin       0x0410
 #define ServerOP_ExpeditionLockState          0x0411
+#define ServerOP_ExpeditionExpired            0x0412
 
 #define ServerOP_DzCharacterChange            0x0450
 #define ServerOP_DzRemoveAllCharacters        0x0451