[implemented] Extend EVENT_ZONE_CHANGED

[votan]

ESO 2.2: We have GetCurrentMapZoneIndex(), GetUnitZoneIndex(unitTag) but the event EVENT_ZONE_CHANGED still just give us localized strings only.
If using this event, we still need a reserve-lookup-table from name to index. Even more than before, if we use the new function GetUnitZoneIndex.

It would be nice if this event would add these parameters at the end: zoneIndex and subzoneIndex

Thank You