DB/Misc: Fix Blowing Hodir's Horn

Fix by KirkHammett closes #10270
DB/EAI: Remove forgotten EAI scripts

984fa01b61d814e3864
Core/Scripting: Add Wrathbone Flayer script to show channelling visual and correct combat AI.
Core/Movement: Do not remove movement flags that have special opcodes associated with them on teleport

Closes #10162
Script/Commands: Fix a crash in .arena captain command
DB/Errors: Fix a db startup error
Core/Players: Dueling players in your party / raid should not make them always detectable.

Fixes seeing stealthed rogues & druids, as well as invisible mages in duels.
DB/Items: Change item_template.Flags to uint32 (int(10) unsigned)
SQL: Prevent a warning in 2013_07_14_01_world_item_template.sql
Scripted/Misc: Fix random stuff
Core: Fix build
Core/Config: Refactored ConfigMgr

* Loading initial configuration files is now separate from loading any additional custom configs
DB/Gossip: Add missing gossip for Sputtervalve. Moved all scripting to SAI.
DB/Gossip: Gossip fixup for Drull and Tog'thar
DB/Gossip: Added gossip for Morridune.
Scripting/Black Fathom Deeps: Fixed script to use proper spell.
DB/Gossip: Add and fix a few more gossip menus.
DB/Misc: Few fixes for Naxxramas.
DB/Gameobject: Fix spawnMask for Orb of Naxxramas
DB/Condition: Fix startup error