Scripts/Spells: Move shaman Lava Burst crit chance calculation to scripts and add Lava Burst Overload

Port From (https://github.com/TrinityCore/TrinityCore/commit/1696d738608fa8ed30321b5b4050d5516b5765f6)

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

@@ -684,16 +684,6 @@ namespace Game.Entities
                                 if (caster.FindCurrentSpellBySpellId(5938) != null)
                                     crit_chance = 0.0f;
                                 break;
-                            case SpellFamilyNames.Shaman:
-                                // Lava Burst
-                                if (spellInfo.SpellFamilyFlags[1].HasAnyFlag(0x00001000u))
-                                {
-                                    if (GetAuraEffect(AuraType.PeriodicDamage, SpellFamilyNames.Shaman, new FlagArray128(0x10000000, 0, 0), caster.GetGUID()) != null)
-                                        if (GetTotalAuraModifier(AuraType.ModAttackerSpellAndWeaponCritChance) > -100)
-                                            return 100.0f;
-                                    break;
-                                }
-                                break;
                         }
 
                         // Spell crit suppression

Source/Scripts/Spells/Shaman.cs

@@ -935,6 +935,33 @@ namespace Scripts.Spells.Shaman
         }
     }
 
+    // 285452 - Lava Burst damage
+    [Script] // 285466 - Lava Burst Overload damage
+    class spell_sha_lava_crit_chance : SpellScript
+    {
+        public override bool Validate(SpellInfo spellInfo)
+        {
+            return ValidateSpellInfo(SpellIds.LavaBurstRank2, SpellIds.FlameShock);
+        }
+
+        void CalcCritChance(Unit victim, ref float chance)
+        {
+            Unit caster = GetCaster();
+
+            if (caster == null || victim == null)
+                return;
+
+            if (caster.HasAura(SpellIds.LavaBurstRank2) && victim.HasAura(SpellIds.FlameShock, caster.GetGUID()))
+                if (victim.GetTotalAuraModifier(AuraType.ModAttackerSpellAndWeaponCritChance) > -100)
+                    chance = 100.0f;
+        }
+
+        public override void Register()
+        {
+            OnCalcCritChance.Add(new OnCalcCritChanceHandler(CalcCritChance));
+        }
+    }
+    
     [Script] // 77756 - Lava Surge
     class spell_sha_lava_surge : AuraScript
     {