Three backports from Classic DB and 7 backports from ACID WotLK

- Change stand state of creature 4542 on aggro
- Allow NPC 8400 to stand up on Aggro
- Remove AI script for Velinde Shadowsong
- Add script for npc 8421
- Remove scripts for npcs 1840, 1842 and 12126
- Update ACID scripts for UDB 407
- Remove Several Totem Scripts - Should Be Replaced With TotemAI
- Added script for creature 10299 in Blackrock Spire
- Fixed spell used by creature 11669 (Flame Imp) in Molten Core
- Fixed aggro text of several NPCs …