message: Chariot can also be upgraded to Horse Archer
diff: <bUnitClassUpgrade>1</bUnitClassUpgrade>
  </UnitClassUpgrade>
  </UnitClassUpgrades>
  + <UnitClassUpgrades>
  + <UnitClassUpgrade>
  + <UnitClassUpgradeType>UNITCLASS_HORSE_ARCHER</UnitClassUpgradeType>
  + <bUnitClassUpgrade>1</bUnitClassUpgrade>
  + </UnitClassUpgrade>
  + </UnitClassUpgrades>
  <UnitAIs>
  <UnitAI>
  <UnitAIType>UNITAI_ATTACK</UnitAIType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  </UnitClassUpgrade>
  </UnitClassUpgrades>
  + <UnitClassUpgrades>
  + <UnitClassUpgrade>
  + <UnitClassUpgradeType>UNITCLASS_HORSE_ARCHER</UnitClassUpgradeType>
  + <bUnitClassUpgrade>1</bUnitClassUpgrade>
  + </UnitClassUpgrade>
  + </UnitClassUpgrades>
  <UnitAIs>
  <UnitAI>
  <UnitAIType>UNITAI_ATTACK</UnitAIType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  </UnitClassUpgrade>
  </UnitClassUpgrades>
  + <UnitClassUpgrades>
  + <UnitClassUpgrade>
  + <UnitClassUpgradeType>UNITCLASS_HORSE_ARCHER</UnitClassUpgradeType>
  + <bUnitClassUpgrade>1</bUnitClassUpgrade>
  + </UnitClassUpgrade>
  + </UnitClassUpgrades>
  <UnitAIs>
  <UnitAI>
  <UnitAIType>UNITAI_ATTACK</UnitAIType>
  <bUnitClassUpgrade>1</bUnitClassUpgrade>
  </UnitClassUpgrade>
  </UnitClassUpgrades>
  + <UnitClassUpgrades>
  + <UnitClassUpgrade>
  + <UnitClassUpgradeType>UNITCLASS_HORSE_ARCHER</UnitClassUpgradeType>
  + <bUnitClassUpgrade>1</bUnitClassUpgrade>
  + </UnitClassUpgrade>
  + </UnitClassUpgrades>
  <UnitAIs>
  <UnitAI>
  <UnitAIType>UNITAI_ATTACK</UnitAIType>
  