Scripts/AV: Balinda Stonehearth

- Updated to EventMaps
- Removed manual spawning of Water Elemental by using proper spell
* The Water Elemental has a duration, it'll despawn once it's over. She'll resummon it during the encounter if it dies or disappears.
* Fixes it's level scalling with owner.
- Moved Water Elemental AI to database.
- Script update
** Patch 3.1.0 (14-Apr-2009): Now casts Ice Block.