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
Scripts/BloodFurnace:
* cleanup InstanceScript
* fix broggok poison cloud

Scripts/Naxxramas/Grobbulus:
* fix poison cloud
* fix mutating injection
Fix build
DB/Spawns: remove duplicate NPCs on Zeppelin from Orgrimmar to Thunder Bluff

Closes #11420
Core/SAI: drop unneeded code
Scripts/PoS/Garfrost: cleanup saronit blocks after death
Core/Battlefield: some codestyle changes
Core/Spells: Fix potions cooldown in combat

Fix a cooldown issue related to potions allowing Players in combat to use more than 1 potion in a row, especially with high latency.
This also fixes an exploit about using infinite potions in combat just by skipping the client-side check.
The original implementation c064c2e2e1eebd43b273365583dd181293bafa22 was missing a check in Spell::CheckCast() about this particular case since Potion cooldown is added only after the Player goes out of combat.
Fixes #1259 .
Core/Wintergrasp: Fix typo in CMSG_HEARTH_AND_RESURRECT handler

Fix CMSG_HEARTH_AND_RESURRECT handler trying to resurrect players with 100x hp/mana/energy ( SetHealth()/SetPower() were sanitizing the input anyway ) .
Core/Battlegrounds: Fix offline players not being resurrected when Battleground ends

Fixes #7081
Core/Entities: Implement SMSG_INVALIDATE_PLAYER
Core/Entities: Don't allow to login while character is forced to rename
Merge pull request #11427 from Dehravor/force-rename

Core/Entities: Don't allow to login while character is forced to rename