Fixed SendAddonMessage issue.

This fixes GM's not being able to send/receive addon messages through the whisper channel while accepting whispers are turned off.
Core/SAI: Clear UNIT_STATE_EVADE immediately if we're about to follow a target on EnterEvadeMode (MoveFollow does not clear evade)
Core/PetAI: Pet's owner should NOT enter combat when the pet attacks/enters combat
Core/Spells: Players with active pets count as if they were players in combat against spells with SPELL_ATTR1_CANT_TARGET_IN_COMBAT
Core/Misc: Removed remnants of old db threading model
Core/Vehicles: Set proper power type using PowerDisplay.dbc

Original commit by Xfurry - cmangos/mangos-wotlk/bef8c99cc07c96d4e2f45e0ff6bc107068555ffb
DB/Quest: Fix Gambling Debt

By dr-j, closes #12092
DB/Creature: Fix Crazed Mana Surge

By dr-j, closes #11998
Merge pull request #12018 from Foereaper/master

Core/Misc: Fixed SendAddonMessage issue.
Merge pull request #12083 from Trisjdc/pet_combat

Core/PetAI: Pet's owner should NOT enter combat when the pet attacks/enters combat
Merge pull request #12076 from Trisjdc/even_more_sai

Core/SAI: Clear UNIT_STATE_EVADE immediately if we're about to follow a target on EnterEvadeMode
Core/Misc: Remove Unit::Get* wrappers for ObjectAccessor::Get*
Anfang der Übersetzung
Core/Achievements: Fix ACHIEVEMENT_CRITERIA_TYPE_GET_KILLING_BLOWS
Core/Spells: Nitro Boost should not fail in dungeon maps
Merge pull request #12107 from Trisjdc/nitro_jump

Core/Spells: Nitro Boost should not fail in dungeon maps
Merge pull request #12102 from Trisjdc/achievements

Core/Achievements: Fixed ACHIEVEMENT_CRITERIA_TYPE_GET_KILLING_BLOWS in case killed creature has a loot recipient (Credit would be granted to loot recipient rather than killing blow lander)
Scripts/PoS: fixed rimefang icy blast

Closes #632
Core/SAI: SMART_EVENT_IC_LOS is now called when movement in LOS was made while the creature was in combat
Scripts/Commands: added option to show InhabitType in .npc info command