Core/Spells: Health Funnel now always damages the warlock, even if it does not heal the pet because it's already at full health. Previously it would display the 'Miss' effect on the owner of the pet.

Fixes #9991
Add mailbox command
Core/Players: On CanRewardQuest, use the same item dest vector for all potential rewards
Renamed method
Scripting/Utgarde Pinnacle: Fix visual during Svala's transformation
Core/Instances: Fix exploit too much players in instances/raids
Core/Guild: Implement GR_RIGHT_VIEWOFFNOTE
Core/Guild: HandleRoster should always have a valid session
Core/Instances: Fix Instance binding

Fix players not being bound to instance if the group was disbanded before killing any boss.
Fixes #437
Scripts/Halion: Fixed Soul Consumption's pull effect.

Thanks to Winterfell for pointing out the issue.
Core/Entities: correct creature damage, offhand damage should work too
* todo: some creatures need dmg_multiplier update in creature_template
DB/Spells: remove duplicate/invalid entries from spelldifficulty_dbc
* For new entries: use spellid0 as id to avoid conflicts with dbc file
DB/Spells: correct more spelldifficulty_dbc entries
* add log message to find wrong entries
Core/Threading: Handle CMSG_ZONEUPDATE only in WorldSession update - changing zones triggers changing chat channels, what is not a thread safe operation
Scripts/HoS: update Maiden of Grief
Core/Movement: Fixed vehicle passengers disappearing clientside

Closes #11411
Misc:

* Tools: Fixed a compile warning
* Commands: Fixed npcflag format in .npc info
Core/Entities: add some log messages in CheckCreatureTemplate
* Happy Error Spam
DB: update some creature templates
DB/Creature: update more creature templates