Shield formula like Nostalrius

[peonso]

change on https://github.com/TwistedScorpio/OTHire/blob/master/source/player.cpp
both int32_t Player::getDefense() const and float Player::getDefenseFactor() const

float Player::getDefenseFactor() const
{
	switch(fightMode){
		case FIGHTMODE_ATTACK:
		{
			return 0.6f;
			break;
		}

		case FIGHTMODE_BALANCED:
		{
			return 1.0f;
			break;
		}

		case FIGHTMODE_DEFENSE:
		{
			return 1.8f;
			break;
		}

		default:
			return 1.0f;
			break;
	}
}

int32_t Player::getDefense() const
{
	int32_t defenseSkill = getSkill(SKILL_FIST, SKILL_LEVEL);
	int32_t defenseValue = 5;
	float defenseFactor = getDefenseFactor();
	const Item* weapon = NULL;
	const Item* shield = NULL;
	getShieldAndWeapon(shield, weapon);

	if(weapon){
		defenseValue = weapon->getDefense() + 1;
		defenseSkill = getWeaponSkill(weapon);
	}

	if(shield){
		defenseValue = shield->getDefense() + 1;
		defenseSkill = getSkill(SKILL_SHIELD, SKILL_LEVEL);
	}

	if(defenseSkill == 0)
		return 0;

	if(vocation && vocation->getBaseDefense() != 1.0){
		defenseValue = int32_t(defenseValue * vocation->getBaseDefense());
	}
	
	// Nostalrius use this to default to full def when you are not attacking anything, we don't have access to this variables, so it's not implemented
	/* if ((followCreature || !attackedCreature) && earliestAttackTime <= OTSYS_TIME()) {
		defenseFactor = 1.8;
	} */
	
	int32_t randresult1 = (uint32_t)random_range(0, 99);
	int32_t randresult2 = (uint32_t)random_range(0, 99);

	return ((int32_t)std::floor((float)((5 * defenseSkill + 50)* defenseValue * defenseFactor * (randresult1+randresult2) / 2 / 10000.)));
}