Core/Scripts: Added CalcCastTime spell script hook

Port From (https://github.com/TrinityCore/TrinityCore/commit/6713fa4c93f87af351f3ee65c1ff36b52ea85ddb)

Source/Game/Spells/Spell.cs

@@ -2505,18 +2505,7 @@ namespace Game.Spells
             // Prepare data for triggers
             PrepareDataForTriggerSystem();
 
-            if (m_caster.IsTypeId(TypeId.Player))
-            {
-                if (!m_caster.ToPlayer().GetCommandStatus(PlayerCommandStates.Casttime))
-                {
-                    // calculate cast time (calculated after first CheckCast check to prevent charge counting for first CheckCast fail)
-                    m_casttime = m_spellInfo.CalcCastTime(this);
-                }
-                else
-                    m_casttime = 0;
-            }
-            else
-                m_casttime = m_spellInfo.CalcCastTime(this);
+            m_casttime = CallScriptCalcCastTimeHandlers(m_spellInfo.CalcCastTime(this));
 
             if (m_caster.IsUnit() && m_caster.ToUnit().IsMoving())
             {
@@ -7462,6 +7451,17 @@ namespace Game.Spells
             return retVal;
         }
 
+        int CallScriptCalcCastTimeHandlers(int castTime)
+        {
+            foreach (var script in m_loadedScripts)
+            {
+                script._PrepareScriptCall(SpellScriptHookType.CalcCastTime);
+                castTime = script.CalcCastTime(castTime);
+                script._FinishScriptCall();
+            }
+            return castTime;
+        }
+
         bool CallScriptEffectHandlers(uint effIndex, SpellEffectHandleMode mode)
         {
             // execute script effect handler hooks and check if effects was prevented