Core/Auras: Added support for SPELL_ATTR5_LIMIT_N limit to other number than just 1

Port From (https://github.com/TrinityCore/TrinityCore/commit/d818add0e20fcf2c86ef46b5cd94f942488511a0)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -1762,7 +1762,7 @@ namespace Framework.Constants
         RemoveEnteringArena = 0x04, // Remove Entering Arena Description Force This Aura To Be Removed On Entering Arena, Regardless Of Other Properties
         AllowWhileStunned = 0x08, // Allow While Stunned
         TriggersChanneling = 0x10, // Triggers Channeling
-        LimitN = 0x20, /*Incomplete Impl*/ // Limit N Description Remove Previous Application To Another Unit If Applied
+        LimitN = 0x20, // Limit N Description Remove Previous Application To Another Unit If Applied
         IgnoreAreaEffectPvpCheck = 0x40, /*Nyi*/ // Ignore Area Effect Pvp Check
         NotOnPlayer = 0x80, /*Nyi*/ // Not On Player
         NotOnPlayerControlledNpc = 0x100, /*Nyi*/ // Not On Player Controlled Npc

Source/Game/Entities/Unit/Unit.Spells.cs

@@ -3934,14 +3934,18 @@ namespace Game.Entities
 
                 // register single target aura
                 caster.m_scAuras.Add(aura);
-                // remove other single target auras
-                var scAuras = caster.GetSingleCastAuras();
-                for (var i = 0; i < scAuras.Count; ++i)
-                {
-                    var aur = scAuras[i];
-                    if (aur != aura && aur.IsSingleTargetWith(aura))
-                        aur.Remove();
 
+                Queue<Aura> aurasSharingLimit = new();
+                // remove other single target auras
+                foreach (Aura scAura in caster.GetSingleCastAuras())
+                    if (scAura != aura && scAura.IsSingleTargetWith(aura))
+                        aurasSharingLimit.Enqueue(scAura);
+
+                uint maxOtherAuras = aura.GetSpellInfo().MaxAffectedTargets - 1;
+                while (aurasSharingLimit.Count > maxOtherAuras)
+                {
+                    aurasSharingLimit.Peek().Remove();
+                    aurasSharingLimit.Dequeue();
                 }
             }
         }

Source/Game/Spells/SpellManager.cs

@@ -4379,7 +4379,7 @@ namespace Game.Entities
                 if (spellInfo.ActiveIconFileDataId == 135754)  // flight
                     spellInfo.Attributes |= SpellAttr0.Passive;
 
-                if (spellInfo.IsSingleTarget())
+                if (spellInfo.IsSingleTarget() && spellInfo.MaxAffectedTargets == 0)
                     spellInfo.MaxAffectedTargets = 1;
             }