Fix pets lagging behind and despawning by slightly adjusting speed
if too far from owner.

Closes #8740
Update src/server/game/Entities/Unit/Unit.cpp

Fix crash on "tame pet"
Update src/server/game/Entities/Unit/Unit.cpp

Code style cleanup
Update src/server/game/Entities/Unit/Unit.cpp

Revert codestyle changes to cut down on calls to GetCharmerOrOwner()
Update src/server/game/Achievements/AchievementMgr.cpp

Core/Achievements: Add player name and guid to CompletedAchievement log
DB/SAI: SAI for some of the trash in ICC Closes #8773
DB/Gameobject: Add Invincible Grave Plaque Closes #8693
DB/Item: add proper flags to real-life-duration items Closes #3601
Core/Spells: Rename SPELL_EFFECT_PLAYER_NOTIFICATION to SPELL_EFFECT_PLAY_SOUND
Core/SmartScripts: Fixed SAI targets 10 & 14 (SMART_TARGET_CREATURE_GUID, SMART_TARGET_GAMEOBJECT_GUID)

Note: If you used these targets to perform actions across maps, it will not work anymore, this functionality is deprecated as it was not safe.
Core/Scripts: Drop `gameobject_scripts` table - empty, deprecated and no longer needed
DB/Misc: fix some startup errors
typofix IN not =
DB/Quest: fix some quest linking for Winter Veil
DB/Spell: add aura allowing player to see miscaller soo-gan for a quest

Closes #7868
Various issuetracker fixes

Immunities for Shambling Horror by Valcorb Closes #7541
Flying and  a path for Higherch by Malcrom Closes #7436
SAI for Talonshrike by Nevadas Closes #8639
Merge pull request #8753 from MrSmite/Pet_SpeedFix

Fix pets lagging behind and despawning
Core/Scripting: Add Kirtonos The Herald to c++ scripting. Combat still not finished.
Core/Scripting: Add a few includes to boss_kirtonos_the_herald.
DB: Re-add creature text for SAI conversion