Update event command strings

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*EnemyEncounter
*OpenShop
*ShowInn
*EnterHeroName
*Teleport
*MemorizeLocation
*RecallToLocation
*EnterExitVehicle
*SetVehicleLocation
*ChangeEventLocation
*TradeEventLocations
*StoreTerrainID
*StoreEventID
*EraseScreen
*ShowScreen
*TintScreen
*FlashScreen