Core/Spell: fix some issues with taunt spells

Port From (https://github.com/TrinityCore/TrinityCore/commit/575f42089e2014c3df64f0468ed25c45a544f6d8)

Source/Game/Spells/Spell.cs

@@ -7790,6 +7790,10 @@ namespace Game.Spells
             else if (MissCondition == SpellMissInfo.Reflect && ReflectResult == SpellMissInfo.None)
                 _spellHitTarget = spell.GetCaster().ToUnit();
 
+            // Ensure that a player target is put in combat by a taunt, even if they result immune clientside
+            if ((MissCondition == SpellMissInfo.Immune || MissCondition == SpellMissInfo.Immune2) && spell.GetCaster().IsPlayer() && unit.IsPlayer() && spell.GetCaster().IsValidAttackTarget(unit, spell.GetSpellInfo()))
+                unit.SetInCombatWith(spell.GetCaster().ToPlayer());
+
             _enablePVP = false; // need to check PvP state before spell effects, but act on it afterwards
             if (_spellHitTarget)
             {

Source/Game/Spells/SpellEffects.cs

@@ -2473,7 +2473,18 @@ namespace Game.Spells
 
             // this effect use before aura Taunt apply for prevent taunt already attacking target
             // for spell as marked "non effective at already attacking target"
-            if (unitTarget == null || !unitTarget.CanHaveThreatList())
+            if (!unitTarget || unitTarget.IsTotem())
+            {
+                SendCastResult(SpellCastResult.DontReport);
+                return;
+            }
+
+            // Hand of Reckoning can hit some entities that can't have a threat list (including players' pets)
+            if (m_spellInfo.Id == 62124)
+                if (!unitTarget.IsPlayer() && unitTarget.GetTarget() != unitCaster.GetGUID())
+                    unitCaster.CastSpell(unitTarget, 67485, true);
+
+            if (!unitTarget.CanHaveThreatList())
             {
                 SendCastResult(SpellCastResult.DontReport);
                 return;
@@ -2967,7 +2978,6 @@ namespace Game.Spells
                             }
                             return;
                         }
-                        break;
                     }
                     break;
                 }