Core/Spells: Removed old combo point code leftovers

Port From (https://github.com/TrinityCore/TrinityCore/commit/197d4369c894e9b088f862c7189f4fe20b4836ca)

Source/Game/Entities/Player/Player.Combat.cs

@@ -518,8 +518,8 @@ namespace Game.Entities
             opponent.RemoveAurasWithInterruptFlags(SpellAuraInterruptFlags2.DuelEnd);
 
             // cleanup combo points
-            ClearComboPoints();
-            opponent.ClearComboPoints();
+            SetPower(PowerType.ComboPoints, 0);
+            opponent.SetPower(PowerType.ComboPoints, 0);
 
             //cleanups
             SetDuelArbiter(ObjectGuid.Empty);

Source/Game/Entities/Player/Player.cs

@@ -645,8 +645,8 @@ namespace Game.Entities
 
                 // drunken state is cleared on death
                 SetDrunkValue(0);
-                // lost combo points at any target (targeted combo points clear in Unit::setDeathState)
-                ClearComboPoints();
+
+                SetPower(PowerType.ComboPoints, 0);
 
                 ClearResurrectRequestData();
 
@@ -723,7 +723,7 @@ namespace Game.Entities
                 StopCastingCharm();
                 StopCastingBindSight();
                 UnsummonPetTemporaryIfAny();
-                ClearComboPoints();
+                SetPower(PowerType.ComboPoints, 0);
                 GetSession().DoLootReleaseAll();
                 m_lootRolls.Clear();
                 OutdoorPvPMgr.HandlePlayerLeaveZone(this, m_zoneUpdateId);

Source/Game/Entities/Unit/Unit.cs

@@ -3343,47 +3343,6 @@ namespace Game.Entities
             return nearMembers[randTarget];
         }
 
-        public uint GetComboPoints() { return (uint)GetPower(PowerType.ComboPoints); }
-
-        public void AddComboPoints(sbyte count, Spell spell = null)
-        {
-            if (count == 0)
-                return;
-
-            sbyte comboPoints = (sbyte)(spell != null ? spell.m_comboPointGain : GetPower(PowerType.ComboPoints));
-
-            comboPoints += count;
-
-            if (comboPoints > 5)
-                comboPoints = 5;
-            else if (comboPoints < 0)
-                comboPoints = 0;
-
-            if (!spell)
-                SetPower(PowerType.ComboPoints, comboPoints);
-            else
-                spell.m_comboPointGain = comboPoints;
-        }
-
-        void GainSpellComboPoints(sbyte count)
-        {
-            if (count == 0)
-                return;
-
-            sbyte cp = (sbyte)GetPower(PowerType.ComboPoints);
-
-            cp += count;
-            if (cp > 5) cp = 5;
-            else if (cp < 0) cp = 0;
-
-            SetPower(PowerType.ComboPoints, cp);
-        }
-
-        public void ClearComboPoints()
-        {
-            SetPower(PowerType.ComboPoints, 0);
-        }
-
         public void ClearAllReactives()
         {
             for (ReactiveType i = 0; i < ReactiveType.Max; ++i)