Core/Spells: Implement spell queue

Port From (https://github.com/TrinityCore/TrinityCore/commit/27019a62a4294f8dd48d975f85b1907c5adee0e3)

Source/Game/Spells/Spell.cs

@@ -8121,6 +8121,8 @@ namespace Game.Spells
             return m_casttime;
         }
 
+        public int GetRemainingCastTime() { return m_timer; }
+
         bool IsAutoRepeat()
         {
             return m_autoRepeat;

Source/Game/Spells/SpellCastRequest.cs

@@ -0,0 +1,37 @@
+// Copyright (c) CypherCore <http://github.com/CypherCore> All rights reserved.
+// Licensed under the GNU GENERAL PUBLIC LICENSE. See LICENSE file in the project root for full license information.
+
+using Game.Entities;
+using Game.Networking.Packets;
+
+namespace Game.Spells
+{
+    public class SpellCastRequestItemData
+    {
+        public byte PackSlot;
+        public byte Slot;
+        public ObjectGuid CastItem;
+
+        public SpellCastRequestItemData(byte packSlot, byte slot, ObjectGuid castItem)
+        {
+            PackSlot = packSlot;
+            Slot = slot;
+            CastItem = castItem;
+        }
+    }
+
+    public class SpellCastRequest
+    {
+        public SpellCastRequestPkt CastRequest;
+        public ObjectGuid CastingUnitGUID;
+        public SpellCastRequestItemData ItemData;
+
+        public SpellCastRequest(SpellCastRequestPkt castRequest, ObjectGuid castingUnitGUID, SpellCastRequestItemData? itemData = null)
+        {
+            CastRequest = castRequest;
+            CastingUnitGUID = castingUnitGUID;
+            ItemData = itemData;
+        }
+    }
+
+}

Source/Game/Spells/SpellCastTargets.cs

@@ -18,7 +18,7 @@ namespace Game.Spells
             m_dst = new SpellDestination();
         }
 
-        public SpellCastTargets(Unit caster, SpellCastRequest spellCastRequest)
+        public SpellCastTargets(Unit caster, SpellCastRequestPkt spellCastRequest)
         {
             m_targetMask = spellCastRequest.Target.Flags;
             m_objectTargetGUID = spellCastRequest.Target.Unit;

Source/Game/Spells/SpellHistory.cs

@@ -537,7 +537,7 @@ namespace Game.Spells
             }
 
             if (cooldownEntry.CooldownEnd <= now)
-            {                
+            {
                 _categoryCooldowns.Remove(cooldownEntry.CategoryId);
                 _spellCooldowns.Remove(cooldownEntry.SpellId);
             }
@@ -697,7 +697,7 @@ namespace Game.Spells
         {
             return GetRemainingCategoryCooldown(spellInfo.GetCategory());
         }
-        
+
         public void LockSpellSchool(SpellSchoolMask schoolMask, TimeSpan lockoutTime)
         {
             DateTime now = GameTime.GetSystemTime();
@@ -921,6 +921,18 @@ namespace Game.Spells
             _globalCooldowns[spellInfo.StartRecoveryCategory] = new DateTime();
         }
 
+        public TimeSpan GetRemainingGlobalCooldown(SpellInfo spellInfo)
+        {
+            if (!_globalCooldowns.TryGetValue(spellInfo.StartRecoveryCategory, out DateTime end))
+                return TimeSpan.Zero;
+
+            DateTime now = GameTime.GetDateAndTime();
+            if (end < now)
+                return TimeSpan.Zero;
+
+            return end - now;
+        }
+
         public Player GetPlayerOwner()
         {
             return _owner.GetCharmerOrOwnerPlayerOrPlayerItself();
@@ -952,7 +964,7 @@ namespace Game.Spells
                 player.SendPacket(setSpellCharges);
             }
         }
-        
+
         void GetCooldownDurations(SpellInfo spellInfo, uint itemId, ref uint categoryId)
         {
             TimeSpan notUsed = TimeSpan.Zero;