Core/Pets: updated many pet damage formulars and apply spellpower bonus for warlock pets

src/server/game/Spells/SpellEffects.cpp

@@ -420,6 +420,16 @@ void Spell::EffectSchoolDMG(SpellEffIndex effIndex)
                             damage += damage / 6;
                     }
                 }
+
+                // Warlock Pets deal 50% of the coefficient's spell power bonus as bonus damage
+                if (m_caster->IsPet())
+                {
+                    if (Unit* owner = m_caster->GetCharmerOrOwner())
+                    {
+                        damage = CalculatePct(owner->SpellDamageBonusDone(unitTarget, m_spellInfo, (uint32)damage, SPELL_DIRECT_DAMAGE, effIndex), 50);
+                        damage = unitTarget->SpellDamageBonusTaken(owner, m_spellInfo, (uint32)damage, SPELL_DIRECT_DAMAGE);
+                    }
+                }
                 break;
             }
             case SPELLFAMILY_PRIEST: