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()
Core/Scripting: Created a hook for when a player is about to be saved.
Grammar/Spelling fix.
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
Core/Scripts: Some cleanup for boss_kirtonos_the_herald script
Update src/server/game/Achievements/AchievementMgr.cpp

Prevent achievement completion log spam.
db/commit: fix sql error
DB/SAI: Fix crash with quest "Thirst Unending"
Closes #8856
Core/Misc: Use ASSERT (custom, better macro) instead of the C macro assert()
Core/Player: Prevent a crash in CastedCreatureOrGO and add an assertion to KilledMonster
Core/Scripting: Update Kirtonos script.
Core/Misc: Fix a couple of warnings, some of them performance related

Errors were found using Cppcheck, open-source static analysis tool
Core/Scripting: Fix Typo.
Core/Spline: Fix typo, I blame not enough Ctrl+S