* Added AEGIS 'CLASS_' enum
- Removed RC_BOSS, RC_NONBOSS, RC_NONDEMIHUMAN.
- Added CLASS_NORMAL, CLASS_BOSS, CLASS_GUARDIAN enum.
- Added CLASS_ALL, RC_ALL, ELE_ALL, SZ_ALL.
- Item bonuses 'bAddDefClass' and 'bAddMdefClass' replaced by 'bAddDefMonster' and 'bAddMdefMonster'.
- Item bonuses 'bIgnoreMdefRate' and 'bIgnoreDefRate' replaced by 'bIgnoreMdefRaceRate' and 'bIgnoreDefRaceRate'.
- Added new item bonuses: bIgnoreDefClass, bIgnoreMdefRaceRate, bDefRatioAtkClass, bAddClass, bSubClass, bMagicAddClass, bWeaponComaClass, bHpDrainValueClass, bSpDrainValueClass, bIgnoreMdefClassRate.
- Updated doc/item_bonus.txt
- Updated db/re/level_penalty.txt & 'pc_level_penalty_mod' function.
- Updated 'battle_calc_cardfix' function.
- 'md->class_' replaced by 'md->mob_id'
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