Core/SmartAI:

- Drop useless actions SMART_ACTION_ENTER_VEHICLE, SMART_ACTION_LEAVE_VEHICLE and SMART_ACTION_REMOVE_PASSENGERS.
(Vehicles are aura-driven, just remove or add the proper aura to achieve the same as these actions did)
- Fixed possible crash in SMART_ACTION_SEND_GOSSIP_MENU
- Areatriggers should not be triggered by dead players

src/server/game/AI/SmartScripts/SmartAI.cpp

@@ -917,13 +917,13 @@ class SmartTrigger : public AreaTriggerScript
 {
     public:
 
-        SmartTrigger()
-            : AreaTriggerScript("SmartTrigger")
-        {
-        }
+        SmartTrigger() : AreaTriggerScript("SmartTrigger") {}
 
         bool OnTrigger(Player* player, AreaTriggerEntry const* trigger)
         {
+            if (!player->isAlive())
+                return false;
+
             sLog->outDebug(LOG_FILTER_DATABASE_AI, "AreaTrigger %u is using SmartTrigger script", trigger->id);
             SmartScript script;
             script.OnInitialize(NULL, trigger);