Core/Stats: disabled armor penetration handlings and removed related functions as they are deprecated since Cataclysm

src/server/game/Entities/Unit/StatSystem.cpp

@@ -226,7 +226,6 @@ bool Player::UpdateAllStats()
     UpdateManaRegen();
     UpdateExpertise(BASE_ATTACK);
     UpdateExpertise(OFF_ATTACK);
-    RecalculateRating(CR_ARMOR_PENETRATION);
     UpdateAllResistances();
 
     return true;
@@ -673,12 +672,6 @@ void Player::UpdateSpellCritChance(uint32 school)
     SetFloatValue(PLAYER_SPELL_CRIT_PERCENTAGE1 + school, crit);
 }
 
-void Player::UpdateArmorPenetration(int32 amount)
-{
-    // Store Rating Value
-    SetUInt32Value(PLAYER_FIELD_COMBAT_RATING_1 + CR_ARMOR_PENETRATION, amount);
-}
-
 void Player::UpdateMeleeHitChances()
 {
     m_modMeleeHitChance = GetRatingBonusValue(CR_HIT_MELEE);