Scripts/Misc: Fix uninitialized values

Fix uninitialized values in scripts reported by valgrind.
Scripting/War Master Voone: Fix Cleave spell and minor cleanup.
Merge branch 'master' of github.com:TrinityCore/TrinityCore
Core/Chat: Fix assert triggered by .npc add

Fix an assert in Aura::_UnapplyForTarget() caused by ".npc add" changing the guid of the spawned Creature.
Scripts/Misc: Fix uninitialized values

Fix uninitialized values in scripts reported by valgrind.
Fix target and GetOwner() NULL dereferences .