Core/Misc: Fix various crashes, also related to multithreading

Port From (https://github.com/TrinityCore/TrinityCore/commit/ad008c43b75080ec59aa973f1e2e4424332c34a4)

Source/Game/Entities/Player/KillRewarder.cs

@@ -104,7 +104,7 @@ namespace Game.Entities
                     Player member = refe.GetSource();
                     if (member)
                     {
-                        if (member.IsAlive() && member.IsAtGroupRewardDistance(_victim))
+                        if (_killer == member || (member.IsAtGroupRewardDistance(_victim) && member.IsAlive()))
                         {
                             uint lvl = member.getLevel();
                             // 2.1. _count - number of alive group members within reward distance;
@@ -254,7 +254,8 @@ namespace Game.Entities
                         Player member = refe.GetSource();
                         if (member)
                         {
-                            if (member.IsAtGroupRewardDistance(_victim))
+                            // Killer may not be at reward distance, check directly
+                            if (_killer == member || member.IsAtGroupRewardDistance(_victim))
                             {
                                 _RewardPlayer(member, isDungeon);
                                 member.UpdateCriteria(CriteriaTypes.SpecialPvpKill, 1, 0, 0, _victim);

Source/Game/Entities/Player/Player.DB.cs

@@ -1525,6 +1525,10 @@ namespace Game.Entities
                         stmt.AddValue(2, GetGUID().GetCounter());
                         trans.Append(stmt);
 
+                        RemoveTradeableItem(item);
+                        RemoveEnchantmentDurationsReferences(item);
+                        RemoveItemDurations(item);
+
                         // also THIS item should be somewhere else, cheat attempt
                         item.FSetState(ItemUpdateState.Removed); // we are IN updateQueue right now, can't use SetState which modifies the queue
                         DeleteRefundReference(item.GetGUID());

Source/Game/Entities/Player/Player.Groups.cs

@@ -76,7 +76,7 @@ namespace Game.Entities
 
                 // @todo Should also be sent when anyone has recently left combat, with an aprox ~5 seconds timer.
                 for (GroupReference refe = grp.GetFirstMember(); refe != null; refe = refe.next())
-                    if (refe.GetSource() && refe.GetSource().IsInCombat())
+                    if (refe.GetSource() && refe.GetSource().IsInMap(this) && refe.GetSource().IsInCombat())
                         return PartyResult.PartyLfgBootInCombat;
 
                 /* Missing support for these types
@@ -192,15 +192,13 @@ namespace Game.Entities
 
         public bool IsAtGroupRewardDistance(WorldObject pRewardSource)
         {
-            if (!pRewardSource)
+            if (!pRewardSource || !IsInMap(pRewardSource))
                 return false;
+
             WorldObject player = GetCorpse();
             if (!player || IsAlive())
                 player = this;
 
-            if (player.GetMapId() != pRewardSource.GetMapId() || player.GetInstanceId() != pRewardSource.GetInstanceId())
-                return false;
-
             if (player.GetMap().IsDungeon())
                 return true;
 

Source/Game/Entities/Player/Player.Spells.cs

@@ -967,6 +967,16 @@ namespace Game.Entities
                 }
             }
         }
+
+        void RemoveEnchantmentDurationsReferences(Item item)
+        {
+            foreach (var enchantDuration in m_enchantDuration)
+            {
+                if (enchantDuration.item == item)
+                    m_enchantDuration.Remove(enchantDuration);
+            }
+        }
+
         public void RemoveArenaEnchantments(EnchantmentSlot slot)
         {
             // remove enchantments from equipped items first to clean up the m_enchantDuration list
@@ -1043,7 +1053,12 @@ namespace Game.Entities
             }
             // from spell cases (m_lastPotionId set in Spell.SendSpellCooldown)
             else
-                GetSpellHistory().SendCooldownEvent(spell.m_spellInfo, m_lastPotionId, spell);
+            {
+                if (spell.IsIgnoringCooldowns())
+                    return;
+                else
+                    GetSpellHistory().SendCooldownEvent(spell.m_spellInfo, m_lastPotionId, spell);
+            }
 
             m_lastPotionId = 0;
         }

Source/Game/Entities/Player/Player.cs

@@ -862,6 +862,7 @@ namespace Game.Entities
                 StopCastingCharm();
                 StopCastingBindSight();
                 UnsummonPetTemporaryIfAny();
+                ClearComboPoints();
                 Global.OutdoorPvPMgr.HandlePlayerLeaveZone(this, m_zoneUpdateId);
                 Global.BattleFieldMgr.HandlePlayerLeaveZone(this, m_zoneUpdateId);
             }
@@ -7031,15 +7032,13 @@ namespace Game.Entities
 
         bool IsAtRecruitAFriendDistance(WorldObject pOther)
         {
-            if (!pOther)
+            if (!pOther || !IsInMap(pOther))
                 return false;
+
             WorldObject player = GetCorpse();
             if (!player || IsAlive())
                 player = this;
 
-            if (player.GetMapId() != pOther.GetMapId() || player.GetInstanceId() != pOther.GetInstanceId())
-                return false;
-
             return pOther.GetDistance(player) <= WorldConfig.GetFloatValue(WorldCfg.MaxRecruitAFriendDistance);
         }