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 .
Typo
Sync mit TW
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore