Scripts/Onyxia Lair: Fix debug assertions about iterators
DB/Gameobject: cage door quest Freedom for all creatures

Updates #4823, this only closes door, it still needs scripting.
DB/Gameobject: Dun Argol Cage

By dr-j, closes #11649
DB/Trainers: Fix some spells avariability

Closes #11248
DB/SAI: Fix The Multiphase Survey

Closes #6279 by untaught.
DB/SAI: The Grimtotem Weapon

by dr-j closes #3119
Core/MMAPs: Replace an assert with error log

Replace an assert in PathGenerator::BuildPolyPath() about invalid poly reference with an error log.
Fixes #11493 .
Merge remote-tracking branch 'upstream/master'