Scripts/FollowerAI: Some cleanup:

- FollowerAI properly resumes follow after evading.
- Removed duplicated getters from CreatureAI (IsEscorted vs IsEscortNPC), they were used to do the same thing
- FollowerAI properly assists in combat.
- FollowerAI properly despawns if quest is abandoned.
- FollowerAI now supports dynamic respawning for escort NPCs.

src/server/scripts/Kalimdor/zone_darkshore.cpp

@@ -161,7 +161,7 @@ public:
             {
                 me->SetStandState(UNIT_STAND_STATE_STAND);
                 Talk(SAY_KER_START, player);
-                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, quest);
+                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, QUEST_SLEEPER_AWAKENED);
             }
         }
     };

src/server/scripts/Kalimdor/zone_tanaris.cpp

@@ -326,7 +326,7 @@ public:
                 if (me->IsWithinDistInMap(who, INTERACTION_DISTANCE))
                 {
                     Player* player = GetLeaderForFollower();
-                    if (player && player->GetQuestStatus(QUEST_TOOGA) == QUEST_STATUS_INCOMPLETE)
+                    if (player)
                         player->GroupEventHappens(QUEST_TOOGA, me);
 
                     TortaGUID = who->GetGUID();
@@ -339,10 +339,7 @@ public:
         {
             FollowerAI::MovementInform(MotionType, PointId);
 
-            if (MotionType != POINT_MOTION_TYPE)
-                return;
-
-            if (PointId == POINT_ID_TO_WATER)
+            if ((MotionType == POINT_MOTION_TYPE) && (PointId == POINT_ID_TO_WATER))
                 SetFollowComplete();
         }
 
@@ -416,7 +413,7 @@ public:
         void QuestAccept(Player* player, Quest const* quest) override
         {
             if (quest->GetQuestId() == QUEST_TOOGA)
-                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, quest);
+                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, QUEST_TOOGA);
         }
     };
 

src/server/scripts/Kalimdor/zone_ungoro_crater.cpp

@@ -340,7 +340,7 @@ public:
             if (quest->GetQuestId() == QUEST_A_LITTLE_HELP)
             {
                 me->SetStandState(UNIT_STAND_STATE_STAND);
-                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, quest);
+                StartFollow(player, FACTION_ESCORTEE_N_NEUTRAL_PASSIVE, QUEST_A_LITTLE_HELP);
             }
         }
     };