Core/Events: announce event system improvement. (#1228)

* DB: update timestamps for #1187

src/server/game/Events/GameEventMgr.h

@@ -55,6 +55,7 @@ struct GameEventData
     GameEventConditionMap conditions;  // conditions to finish
     std::set<uint16 /*gameevent id*/> prerequisite_events;  // events that must be completed before starting this event
     std::string description;
+    uint8 announce;         // if 0 dont announce, if 1 announce, if 2 take config value
 
     bool isValid() const { return length > 0 || state > GAMEEVENT_NORMAL; }
 };