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

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

@@ -1702,23 +1702,6 @@ uint32 Unit::CalcArmorReducedDamage(Unit* victim, const uint32 damage, SpellInfo
             armor = std::floor(AddPct(armor, -(*j)->GetAmount()));
     }
 
-    // Apply Player CR_ARMOR_PENETRATION rating
-    if (GetTypeId() == TYPEID_PLAYER)
-    {
-        float maxArmorPen = 0;
-        if (victim->getLevel() < 60)
-            maxArmorPen = float(400 + 85 * victim->getLevel());
-        else
-            maxArmorPen = 400 + 85 * victim->getLevel() + 4.5f * 85 * (victim->getLevel() - 59);
-
-        // Cap armor penetration to this number
-        maxArmorPen = std::min((armor + maxArmorPen) / 3, armor);
-        // Figure out how much armor do we ignore
-        float armorPen = CalculatePct(maxArmorPen, ToPlayer()->GetRatingBonusValue(CR_ARMOR_PENETRATION));
-        // Got the value, apply it
-        armor -= std::min(armorPen, maxArmorPen);
-    }
-
     if (armor < 0.0f)
         armor = 0.0f;