Scripts/Kelthuzad: move spells into spelldifficulty_dbc and cleanup
Core/Chat: Fix AddonMessaging and logging
Core/Movement: Fix LoS issue of NPCs chasing targets

Add Line of Sight checks to WorldObject::GetNearPoint(), fixing to TargetedMovementGenerator not reaching a point with valid LoS to the target and MotionMaster::MoveKnockbackFrom() knocking creatures inside walls.
Remove unused code.
.cheat god should also affect on falling damage.
Fix SPELL_DAMAGE_CLASS_NONE unable to crit

Corrected logic mistake where switch fallthrough was intended (or should have been).
Fixes the following.
// Earth Shield
// Lifebloom Final Bloom
// Divine Hymn
// Item - Bauble of True Blood 10m
// Item - Bauble of True Blood 25m
Merge pull request #11858 from Dimitro/master

.cheat god command should also affect on falling damage.
Merge pull request #11857 from Unholychick/master

Core/Spells: Fix SPELL_DAMAGE_CLASS_NONE unable to crit
Core/Logging: store loggers in cache correctly
Merge pull request #11840 from Rochet2/AddonMessaging

Core/Chat: Fix AddonMessaging and logging
Core/CrashHandler: Log GetLastError() id if no description is found

Log the System Error id returned by GetLastError() in case FormatMessage() doesn't find a proper description for that message.
Core/ChatLog: handle chatlog options with extended logging system
Fix Sweeping Strikes damage
Merge pull request #11847 from trickerer/SS

Core/Spells: Fixed Sweeping Strikes damage
Scripts/Ruby Sanctum: Fixed Onyx Flamecallers not aggroing players once pathing ended.
Scripts/Ruby Sanctum: Fixed Halion engaging combat outside of his Flame Ring.
Core/GameObjects: Fix crash with Summoning Ritual GOs

Fix a crash happening with GAMEOBJECT_TYPE_SUMMONING_RITUAL GameObjects if a Player clicked on the GO, logged out and let another Player click on it.
Issue added in 464c0c16116dfd22b3c104165ce6edd7b7f4a3d4
Fixes #11856
Scripts/ZulGurub: clean up the code and remove old hacks
[TW278] - Core/Scripts: Prevent multiple spawns of Ulag

http://www.wowhead.com/quest=1819/ulag-the-cleaver
Scripts/Commands: Ensure gameobject template is valid from .gob add temp [...]

As per Aokrome's spamming. "Avoids false positive logs"
DB/Item: Fix Essence of the Pure Flame scaling

By gecko32, closes #1925