Core/Creatures: Allow disabling melee attacks for all creatures, not just the ones using SAI

Port From (https://github.com/TrinityCore/TrinityCore/commit/d26d38075cdb56dcef77f05276a360e717cc5032)

Source/Framework/Constants/CreatureConst.cs

@@ -287,7 +287,7 @@ namespace Framework.Constants
         CombatPing = 0x00020000,
         Aquatic = 0x00040000, // Aka Water Only, CreatureTemplateMovement.Ground = 0
         Amphibious = 0x00080000, // CreatureTemplateMovement.Swim = 1
-        NoMeleeFlee = 0x00100000, // Prevents Melee(Does Not Prevent Chasing, Does Not Make Creature Passive). Not Sure What 'Flee' Means But Another Flag Is Named NoMeleeApproach
+        NoMelee = 0x00100000, // Prevents Melee(Does Not Prevent Chasing, Does Not Make Creature Passive). Not Sure What 'Flee' Means But Another Flag Is Named NoMeleeApproach
         VisibleToGhosts = 0x00200000, // CreatureTypeFlagVisibleToGhosts
         PvpEnabling = 0x00400000, // Old UnitFlagPvpEnabling, Now UnitBytes2OffsetPvpFlag From UnitFieldBytes2
         DoNotPlayWoundAnim = 0x00800000, // CreatureTypeFlagDoNotPlayWoundAnim

Source/Game/AI/CoreAI/UnitAI.cs

@@ -54,7 +54,7 @@ namespace Game.AI
 
         public void DoMeleeAttackIfReady()
         {
-            if (me.HasUnitState(UnitState.Casting))
+            if (me.HasUnitState(UnitState.Casting) || (me.IsCreature() && !me.ToCreature().CanMelee()))
                 return;
 
             Unit victim = me.GetVictim();

Source/Game/AI/SmartScripts/SmartAI.cs

@@ -44,7 +44,6 @@ namespace Game.AI
 
         bool _run;
         bool _evadeDisabled;
-        bool _canAutoAttack;
         bool _canCombatMove;
         uint _invincibilityHpLevel;
 
@@ -62,7 +61,6 @@ namespace Game.AI
         {
             _escortInvokerCheckTimer = 1000;
             _run = true;
-            _canAutoAttack = true;
             _canCombatMove = true;
 
             _hasConditions = Global.ConditionMgr.HasConditionsForNotGroupedEntry(ConditionSourceType.CreatureTemplateVehicle, creature.GetEntry());
@@ -339,8 +337,7 @@ namespace Game.AI
             if (!hasVictim)
                 return;
             
-            if (_canAutoAttack)
-                DoMeleeAttackIfReady();
+            DoMeleeAttackIfReady();
         }
 
         bool IsEscortInvokerInRange()
@@ -629,11 +626,11 @@ namespace Game.AI
             if (!IsAIControlled())
             {
                 if (who != null)
-                    me.Attack(who, _canAutoAttack);
+                    me.Attack(who, true);
                 return;
             }
 
-            if (who != null && me.Attack(who, _canAutoAttack))
+            if (who != null && me.Attack(who, true))
             {
                 me.GetMotionMaster().Clear(MovementGeneratorPriority.Normal);
                 me.PauseMovement();
@@ -1074,7 +1071,6 @@ namespace Game.AI
         public bool HasEscortState(SmartEscortState escortState) { return (_escortState & escortState) != 0; }
         public void AddEscortState(SmartEscortState escortState) { _escortState |= escortState; }
         public void RemoveEscortState(SmartEscortState escortState) { _escortState &= ~escortState; }
-        public void SetAutoAttack(bool on) { _canAutoAttack = on; }
 
         public bool CanCombatMove() { return _canCombatMove; }
 

Source/Game/AI/SmartScripts/SmartScript.cs

@@ -615,10 +615,7 @@ namespace Game.AI
                 }
                 case SmartActions.AutoAttack:
                 {
-                    if (!IsSmart())
-                        break;
-
-                    ((SmartAI)_me.GetAI()).SetAutoAttack(e.Action.autoAttack.attack != 0);
+                    _me.SetCanMelee(e.Action.autoAttack.attack != 0);
                     Log.outDebug(LogFilter.ScriptsAi, "SmartScript.ProcessAction. SMART_ACTION_AUTO_ATTACK: Creature: {0} bool on = {1}",
                         _me.GetGUID().ToString(), e.Action.autoAttack.attack);
                     break;

Source/Game/Entities/Creature/Creature.cs

@@ -3246,6 +3246,10 @@ namespace Game.Entities
         public override SpellSchoolMask GetMeleeDamageSchoolMask(WeaponAttackType attackType = WeaponAttackType.BaseAttack) { return m_meleeDamageSchoolMask; }
         public void SetMeleeDamageSchool(SpellSchools school) { m_meleeDamageSchoolMask = (SpellSchoolMask)(1 << (int)school); }
 
+        public bool CanMelee() { return !_staticFlags.HasFlag(CreatureStaticFlags.NoMelee); }
+
+        public void SetCanMelee(bool canMelee) { _staticFlags.ApplyFlag(CreatureStaticFlags.NoMelee, !canMelee); }
+        
         public sbyte GetOriginalEquipmentId() { return m_originalEquipmentId; }
         public byte GetCurrentEquipmentId() { return m_equipmentId; }
         public void SetCurrentEquipmentId(byte id) { m_equipmentId = id; }

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -258,8 +258,14 @@ namespace Game.Entities
 
             Creature creature = ToCreature();
             // creatures cannot attack while evading
-            if (creature != null && creature.IsInEvadeMode())
-                return false;
+            if (creature != null)
+            {
+                if (creature.IsInEvadeMode())
+                    return false;
+
+                if (!creature.CanMelee())
+                    meleeAttack = false;
+            }
 
             // nobody can attack GM in GM-mode
             if (victim.IsTypeId(TypeId.Player))

Source/Game/Scripting/ScriptManager.cs

@@ -1295,9 +1295,9 @@ namespace Game.Scripting
             return ScriptMap.Empty();
         }
 
-        public List<TValue> GetStorage()
+        public ICollection<TValue> GetStorage()
         {
-            return ScriptMap.Values.ToList();
+            return ScriptMap.Values;
         }
 
         public void Unload()