Sets units bonus of a specific property to 0. If bonus is set to 0 saved hash table data is cleared automatically. whichUnit Unit which should bonus cleared of. bonusType Property type which is used for adding bonus. Possible values are: A_BONUS_TYPE_DAMAGE A_BONUS_TYPE_ARMOR A_BONUS_TYPE_LIFE A_BONUS_TYPE_MANA A_BONUS_TYPE_SIGHT_RANGE A_BONUS_TYPE_MANA_REGENERATION A_BONUS_TYPE_LIFE_REGENERATION Returns if bonus was cleared successfully.