Core/Auras: Convert most rules from Aura::CanBeSaved to a custom spell attribute

Port From (https://github.com/TrinityCore/TrinityCore/commit/b4aa698acb88e1a74bc22d97279148a567b88cad)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -1996,10 +1996,11 @@ namespace Framework.Constants
         ReqCasterBehindTarget = 0x20000,
         AllowInflightTarget = 0x40000,
         NeedsAmmoData = 0x80000,
-        BinarySpell = 0x00100000,
-        SchoolmaskNormalWithMagic = 0x00200000,
-        LiquidAura = 0x00400000,
-        IsTalent = 0x00800000
+        BinarySpell = 0x100000,
+        SchoolmaskNormalWithMagic = 0x200000,
+        LiquidAura = 0x400000,
+        IsTalent = 0x800000,
+        AuraCannotBeSaved = 0x1000000
     }
     #endregion
 

Source/Game/Spells/Auras/Aura.cs

@@ -957,49 +957,7 @@ namespace Game.Spells
                 if (GetSpellInfo().IsSingleTarget())
                     return false;
 
-            // No point in saving this, since the stable dialog can't be open on aura load anyway.
-            if (HasEffectType(AuraType.OpenStable))
-                return false;
-
-            // Can't save vehicle auras, it requires both caster & target to be in world
-            if (HasEffectType(AuraType.ControlVehicle))
-                return false;
-
-            // do not save bind sight auras
-            if (HasEffectType(AuraType.BindSight))
-                return false;
-
-            // no charming auras (taking direct control)
-            if (HasEffectType(AuraType.ModPossess) || HasEffectType(AuraType.ModPossessPet))
-                return false;
-
-            // no charming auras can be saved
-            if (HasEffectType(AuraType.ModCharm) || HasEffectType(AuraType.AoeCharm))
-                return false;
-
-            // no battleground player positions
-            if (HasEffectType(AuraType.BattleGroundPlayerPosition) || HasEffectType(AuraType.BattleGroundPlayerPositionFactional))
-                return false;
-
-            // Incanter's Absorbtion - considering the minimal duration and problems with aura stacking
-            // we skip saving this aura
-            // Also for some reason other auras put as MultiSlot crash core on keeping them after restart,
-            // so put here only these for which you are sure they get removed
-            switch (GetId())
-            {
-                case 44413: // Incanter's Absorption
-                case 40075: // Fel Flak Fire
-                case 55849: // Power Spark
-                    return false;
-            }
-
-            // When a druid logins, he doesnt have either eclipse power, nor the marker auras, nor the eclipse buffs. Dont save them.
-            if (GetId() == 67483 || GetId() == 67484 || GetId() == 48517 || GetId() == 48518)
-                return false;
-
-            // Don't save druid forms, only the dummy. It will cast the appropriate form
-            //        Swift Flight            Flight             Aquatic                Stag
-            if (GetId() == 40120 || GetId() == 33943 || GetId() == 1066 || GetId() == 165961)
+            if (GetSpellInfo().HasAttribute(SpellCustomAttributes.AuraCannotBeSaved))
                 return false;
 
             // don't save auras removed by proc system

Source/Game/Spells/SpellManager.cs

@@ -2438,6 +2438,23 @@ namespace Game.Entities
                             break;
                     }
 
+                    switch (effect.ApplyAuraName)
+                    {
+                        case AuraType.OpenStable:    // No point in saving this, since the stable dialog can't be open on aura load anyway.
+                        // Auras that require both caster & target to be in world cannot be saved
+                        case AuraType.ControlVehicle:
+                        case AuraType.BindSight:
+                        case AuraType.ModPossess:
+                        case AuraType.ModPossessPet:
+                        case AuraType.ModCharm:
+                        case AuraType.AoeCharm:
+                        // Controlled by Battleground
+                        case AuraType.BattleGroundPlayerPosition:
+                        case AuraType.BattleGroundPlayerPositionFactional:
+                            spellInfo.AttributesCu |= SpellCustomAttributes.AuraCannotBeSaved;
+                            break;
+                    }
+
                     switch (effect.Effect)
                     {
                         case SpellEffectName.SchoolDamage: